From the horse's mouth:
Sprint’s New Push-to-Talk Service – Sprint Direct Connect – to Launch Next Week
3G CDMA-based Sprint Direct Connect will expand push-to-talk coverage, enhance customers’ broadband data capabilities, and enable new features
Kyocera DuraMax available exclusively from Sprint Oct. 2 for $69.99
OVERLAND PARK, Kan. (BUSINESS WIRE), September 27, 2011 - Sprint (NYSE: S) today announced a Sunday, Oct. 2, launch date for Sprint Direct Connect®, ushering in the next generation of push–to-talk service from the company that pioneered push–to-talk. Sprint Direct Connect will come packed with broadband data capabilities, familiar push-to-talk features, rugged and reliable handsets, and a broadening push-to-talk coverage map expected in early 2012.