We first caught wind of the SCH-R900 after MetroPCS announced that it would be first to carry the Samsung handset when its fledgling LTE network lights up in select markets sometime after the summer. Now the FCC has been kind enough to bless a preproduction R900 with its approval. Not much is known about the dual-mode CDMA / LTE device other than what we can glean off the broad-shouldered image above and certifications for Bluetooth, 802.11b/g W