Few options/ideas

1.) A laptop/nearby computer can function for any voice chat medium, and we know this will be a guaranteed option now and later.
2.) If they implement a voice chat into 2.0 given the option to use it or not in various party/raid scenarios.
3.) If there is a way to run/create/implement certain voice apps in the background on a PS3 (Mumble for PS3 perhaps).

#2 and #3 both would offer the convenience of having everything all in one place and the ability to use the PS3 headset hardware, though at the moment only #1 is a guarantee.