First two new models with Enhanced PTT are now available from AT&T2
Samsung Rugby III is a flip phone that is built to mil-spec 810G and that means it is protected from dust, water and shock. The handset features a 2.4 QVGA screen and a 3MP camera. With a two-year contract, this model is free. The Sonim XP5560 Bolt is a "bar-styled" device that can survive a 6 foot fall onto concrete and submersion in water for up to 30 minutes. With a new PTT contract, you can grab the Bolt for $199.99.
AT&T's new Enhanced PTT is just an additional $5 monthly when added to an existing AT&T voice and data plan, or $30 per month for PTT service. The latter does not include voice or non-PTT data.
source: AT&T via Phonescoop