CES 2015 in Las Vegas has already been and gone so our thoughts turn to MWC 2015 (Mobile World Congress) in Barcelona where many of this year's smartphones and tablets will be launched. Here's what to expect from MWC 2015 from the big names including Samsung, Sony, HTC, LG, Huawei and others. Also see: Best new phones you should be most excited about in 2015.

Scheduled for 2-5 March, MWC 2015 is only a matter of weeks away. For all you fans of mobile tech products it's the highlight of the calendar with CES only bringing a handful of devices this year – namely the LG G Flex 2.

We'll be heading to mainland Europe to bring you full coverage of the show but until then let's take a look at what to expect from the big names which will be exhibiting in Barcelona including smartphones, tablets and wearables.

What to expect from MWC 2015: Samsung

With zero announcements on the mobile side from Samsung at CES, MWC will be an important time for the Korean company. We will certainly get an overview of the firm's plans for 2015 – at least for the first half.

Samsung will almost certainly hold an Unpacked event very close to the show where it will announce the Galaxy S6. All eyes will be on the flagship device but Samsung is unlikely to stop there with a Galaxy S6 Edge, Galaxy S6 mini, budget handsets and others all possible.

On the wearable front, Samsung will supposedly challenge Motorola, LG and others with a round smartwatch codenamed the 'Orbis' which will come with wireless charging, according to SamMobile.

Note: If you're a fan of the Galaxy Note range, Samsung traditionally launches new models later on in the year in September at IFA. That's when to expect the Galaxy Note5 unless Samsung makes a dramatic change to its roadmap.

What to expect from MWC 2015: HTC

There are two products which we have a good idea HTC will launch at MWC and it has already sent out a save the date for Sunday 1 March which says 'Join us to see what's next' and the tag line 'Utopia in progress' (see below).

The event starts at 4pm CET and we fully expect HTC to announce its new flagship smartphone in the form of the HTC One M9 'Hima'. A mini version is always a good possibility but may be announced shortly after MWC.

HTC is also likely to, at long last, announce its entry to the wearable market – currently dubbed the HTC One Wear – and will be announced in partnership with Under Armour.

What to expect from MWC 2015: Sony

Like Samsung, Sony stuck to other areas at CES despite rumours of the Xperia Z4 being unveiled. This seemed unlikely given the firm's six month cycle on flagship handsets.

With the Xperia Z3 range arriving at IFA in September last year, MWC 2015 is spot on for the announcement of a Z4 range which will almost certainly include the Xperia Z4 and Xperia Z4 Compact. It wouldn't be surprising if Sony introduced a new tablet or two but sizes are unclear at the moment. It has already announced the new budget Xperia E4.

Sony is probable to introduce new wearable products to its SmartWear range following the launch of the SmartWatch 3 and SmartBand Talk last year.

What to expect from MWC 2015: LG

LG is the other manufacturer in the big four for MWC and although it did announce the LG G Flex 2 at CES, we're expecting a lot more in Barcelona.

Last year, LG announced the G3 at a London based event in May so it's no certainty that the G4 will arrive in March at MWC. In fact, an LG exec said it won't happen according to The Chosun: "We rolled out the G3 in May last year so we do not plan to unveil the G4 at this year's Mobile World Congress and spend more time perfecting the new phone."

Despite that quote, there's still a chance and the firm will probably announce other smartphones and tablets such as new L-series devices and hopefully a replacement for the LG G Pad 8.3. Read all the LG G4 rumours here.

On the wearable side of things, we wouldn't be surprised to see something new to follow on from the LG G Watch and LG G Watch R - perhaps something more on the fitness tracker side of things. Ahead of MWC, LG has shown off the luxury G Watch Urbane.

What to expect from MWC 2015: Huawei

The Chinese vendor will be present in Barcelona this year and has a press conference scheduled for Sunday 1 March at 3pm. The save the date we've been sent gives no clues as to what will be announced but has confirmed to TechRadar that it will launch an Android Wear smartwatch this year. MWC seems like most likely place to unveil it and the event invitation appears to confirm it. The invitation suggests you'll be able to take a phone call on the device which also seems to have a camera built into the strap.

Although it seemed the launch of the Ascend P8 would take place at MWC this year. Huawei has confirmed to multiple tech media sites that the smartphone will actually be launched in London on 15 April. The Ascend P7 was launched in Paris and theAscend P6 was launched in London.

Huawei has also confirmed it will launch at least one new tablet.

What to expect from MWC 2015: Microsoft

Microsoft doesn’t normally have a big presence at shows like MWC but will be in Barcelona this year. A press conference will take place at 8:30am on 2 March.

“Mobile is transforming communication, advancing the next payment system that alters commerce, and expanding ways in which we interact. Similarly, the world’s premier industry continues to expand. Once again taking place at Fira Gran Via – the world-class venue in the heart of the Mobile World Capital. You won’t want to miss the opportunity to witness the industry’s continued expansion and growth,” said the firm.

Although that doesn’t give much away we expect to hear more about Windows 10 on smartphones and tablets. We could certainly see some new devices unveiled but a new flagship Lumia is less likely and will probably be announced later in the year closer to the full launch of Windows 10.

If you can’t wait to get Windows 10 on your phone you can download the Technical Preview now if you have a selected Lumia handset and don’t mind running buggy software.