When referring to carrier roadmaps, you always have to kind of take them with a grain of salt as they can and often do change on the fly. That said, Sprint's Q3 lineup has just been broken down a little in rumor form, and it does have some Android devices on it that may be of interest.
The first item on the list is said to be the Samsung Epic 2, which will bring a 4-inch display, 1.2GHz single-core Hummingbird processor and a 8MP camera, all wrapped up in a nice QWERTY keyboard form factor. Next up, a full-touch 4G device from Samsung -- details here are lacking but given that the Samsung Within aka Samsung Galaxy S II fits this description nicely it'd come as now surprise if that's exactly what it was when it gets an official announcement.
If this roadmap turns to reality, that means two new Android devices on Sprint between July and September. Seems rather low to us but Sprint did just roll out the HTC EVO 3D as well and who knows what else could be added in the meantime -- or maybe they'll just ride out the EVO 3D through the summer.
Source: This is my next