Microsoft already has a "smart" virtual keyboard for both tablets and smartphones. In fact, it was just recently rumored that it would be bringing its keyboard to Android and iOS, the latter with possibly some interesting special features. So it might, at first, be surprising to hear about its acquisition of UK-based SwiftKey, makers of one of the more popular mobile keyboards. But old Redmond isn't paying $250 million just for a keyboard. It is, in truth, more interested in the AI talent and software behind it.