The face of Android will completely change this weekend

Something cool is happening this weekend: Nearly all the big Android smartphone makers are launching a top-of-the-line model, a "flagship" in mobile-world parlance.

Yep, we're talking Samsung and LG, both of which are sure to deliver a new heavy hitter on Sunday. Huawei, ZTE, Lenovo and Alcatel also have announcements this weekend, and a day or two later Sony and Xiaomi will join them, among other companies.

So what's up? Sunday is when the annual Mobile World Congress (MWC) trade show kicks off in Barcelona, which lasts till Thursday, Feb. 25.