can anyone please clarify/answer my doubts/questions on H1b transfer.let me give you a brief on my situation first:

i was working with a company 'A' on H1b since 2010 and my H1 with them is valid till aug 2013.my project ended last october and i was on bench for two months(my employer made me give him a vacation letter during that time).this month i got a Job through another company 'B' which has applied for my H1 transfer and sent me the reciept number.my previous company doesnt know about my transfer yet.what are the chances of getting my H1 transferred and is there anything else i should take care of?

please help!!!