"Inside sources" claim that T-Mobile USA is readying an Android trio for a mid-to-late July launch.
The LG G3 is expected to launch on the four major US carriers, but details on the AT&T and Sprint launches are still scarce. The G3 is already available in Europe, several days earlier than planned.
The Sony Xperia T2 Ultra, a mid-range sibling of the Xperia Z Ultra, will come on July 23. Rumors of a July launch have been around since March, when the 6.0" phablet got its T-Mo certification.
Note that this info doesn't come officially from T-Mobile and may not be accurate.