I have posted a link, on my new PushToTalk board, to a Podcast from Sprint that details their soon-to-be-released (2008) Nextel Direct Connect. They are also using the term "High Performance Push To Talk"(HPPTT) to describe Sprint's new Direct-Connect over their CDMA network. The service is designed by Qualcomm, and is called "Q-Chat" by Qualcomm.)
You can access a link to that podcast at
PushToTalk Forums, where you can also view recent news about this exciting new service from Sprint.
In that Podcast, you will see that RIM is included in the device-manufacturer lineup for the new Nextel Direct Connect.