Can I change jobs and file PERM and I-140 under EB2 instead prior EB3 with the new employer. How risky the situation is? I can stay with my current employer, but it is going to take at another 3 years to get my GC under EB3. My PD is Feb 2007.
You can file I-485 in the month when your priority date becomes current (and then get EAD). Priority dates are reported in the Visa Bulletin. I see no problem in carrying the priority date forward if you file an EB-2 through a new employer. As to risk, that needs to be evaluated by your lawyers.