Questions on H1B transfer

I am in H1B for the last 10 years.
I am in EB2 with last quarter of 2010 PD and approved I-140.
My spouse got H4 EAD.

Questions to the Gurus... ( all questions are with respect to current state of law)

If I change the employer now...

1. Do I get H1-B extension for another 3 years?

2. Will the H4- EAD be still valid?

3. As of now, at the present rules/conditions, I know I need to start my GC all over again... but will I be able to retain my PD even if my employer revokes my I-140 ( approved in 2011.), just in case.

4. With the new employer, say after 2 years, when my spouse's H4 EAD comes up for renewal, will I be able to renew it, if I still do not have a new I-140 from the new employer?what is needed for the successful renewal...

5. will I be able to renew my H1 again after 3 years with the new employer, even if I still do not have a new I-140 from the new employer ( using the current 140?). what is needed for the successful renewal...

6. BTW, any idea when the premium for PERM processing is going to be available?

Awaiting your feedback.

Please move it to appropriate section, if this is not the correct one.