L1 to H1B with COS effective from Oct 1, but H1 new employment start date could be delayed

[unclesam9]

Hello,

I have been on L1 for the last 2 years with Emp A and a posses a valid visa till Oct 13 end, due to uncertainities beyong Oct end, filed for H1 with Emp B effective from Oct1 with change-of-status (COS), and it has been picked up in lottery..

Unfortunatly, In my recent conversation with Employer B, he says that there could be delay in my joining date around Dec 13/Jan 14 due to some project issues. Having already applied for L1 to H1B COS effective from Oct 1st, which of the below options are feasible ?

1) Can i still work with my current employer on L1 till Oct end and file for L1 Extension.

2) Is there a provision to Cancel COS ( As the appplication is still in initial review)

3) Can i transfer the H1 once approved (effective from oct 1) to my Current Emp or different employer, before H1 start date.

4) After H1 approval, if i file for L1 extension under premium, will it overide the effective H1 COS.

Thanks in advance. Appreciate your advice on this, as i don't know what to do next..