I ran the taskforce last night twice on my level 49 fire/rad both times successful on random PuG teams.
First run we had a fire/ss tank, a spines and bs scrapper, two
blasters, an emp defender, a ff defender, and me.
Second time we had a stone tank, inv/ss tank, ill/rad, fire/kin, an emp defender, dark/dark and me.
Both teams equally breezed through the taskforce. No shivans or nukes were used, although there was some vengeance popping but not on purpose just as players went down normally.
The second team which would probably be looked at as pretty close to an ideal setup, was slower then the first more balanced team.
Either way I think the TF was very fun and should be pretty open to any player on any AT.