Seeing PTT in a device like the TP2 would be pretty slim. If I had to hazard a guess at how it works - the devices with 3G and PTT have both a CDMA and iDEN radio.

The TP2 already looks like it's going to have both GSM and CDMA radios. I think we're reaching the point of technical limitations trying to stuff an iDEN radio in there too.

Still, it's something I would like to have back - it's been a long time since I had a phone with PTT, it was fun