While it seems unlikely that Google will be making any announcements at MWC 2015, the rumors are claiming that Google will have a team in Barcelona in which they will share additional details about Project Ara and will also show off the handset and some of its modules. Word has it that there will be about 50 different modules shown off and there could even be a working prototype which hopefully Google will let us play with.
Project Ara is indeed a rather exciting development in terms of smartphones. The idea that you can swap out modules is a great one as it basically allows users to customize and upgrade their phones without having to buy a completely brand new handset. For example if you just wanted a better camera, you could buy a camera module, or if you wanted more RAM, you could just swap in more RAM, and so on.
It still remains to be seen when Google will be releasing Project Ara to the public, but hopefully we will find out more at MWC 2015, so be sure to check back with us then for the details.