So I thought I would ask the same about ACR. The only thing right now is the daily CC freerolls for FRC members.
It seems the consensus was the same from others that there are no real freerolls or promotions for beginners at Pokerstars right now. I did a thread 'Any worthwhile freerolls on Pokerstars?' as I could not find anything on Pokerstars since I started playing again in March.
I am playing most my poker at 888 due to the high number of current freerolls (private and 888 sponsored), although I also have accounts at Pokerstars and ACR.