You know what makes a lot of sense? The EDGE-only BlackBerry 8520 hitting T-Mobile USA, that's what. The carrier's already shown a penchant for launching pretty 2.5G BlackBerrys in the past, and the 8520 would be a perfect way to continue that tradition (not to say we totally support continuing any 2.5G tradition, but it is what it is). Boy Genius Report is apparently hearing that there's a Q4 launch in store for the so-called Gemini on T-Mobile USA, which feels a bit late to us -- but maybe they're just looking to give the 8900 some breathing room. Trackball for the weekdays, optical mouse for the weekends, maybe?