H1b transfer while H1b extension in process

[rmram22]

Kindly help as we have to decide on the new offer soon.Below is the case!.

1. I am working on H1B for company A and my visa and I94 will expire on 28 Nov 2012. Company A filed extension in regular processing and currently in "initial review"
2. I got offer from Company B and they are ready to file h1b transfer and extension in premium processing.
3. But Company B is asking me to join as soon as i get the receipt number (as soon as they file transfer and extension)

My concern:

If my H1b transfer filed by Company B gets RFE and the transfer approval process gets delayed and goes beyond 28 Nov 2012,

1. Do i need to go out of country for stamping?
2. Possible that Company A might revoke my H1b extension as soon as i leave company. Is it legal to stay beyond 28 Nov 2012 based on H1b transfer filed by Company B?

Kindly help.

[immihelp]

1. No.
2. Yes.

[rmram22]

1. No.
2. Yes.

Thank you for your quick response..

While browsing through forums i was nervous about people saying that " if my extension is revoked/RFE/Denied which causes the bridge process fail and i will be out of status. Please help. What happens if my transfer process goes beyond 28 nov(visa and i94 expiry)? Do i get new petition on Company B name with I94? Thanks for your time.