Pearl-like style to the more traditional (read: non-SureType) form factor preferred by many. Just like its AT&T sibling, T-Mobile's 8800 will obviously top out with EDGE data on all four GSM bands and offer microSD expansion, a media player, Bluetooth 2.0, full HTML web browsing, and a variety of instant messaging clients. Unlike other 8800s, though, T-Mobile's offers myFaves support -- a decidedly personal feature for a decidedly business-oriented handset, we reckon (not to suggest we're complaining, of course). Look for it Monday through "select channels" including the carrier's website; no word yet on when it'll be a commodity item in brick-and-mortar stores.
[Thanks to everyone who sent this in]