Withdrawal notice by Employer A will not impact H-1B petition filed by your new employer if you are not in the U.S.
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What you are describing is not a transfer.
It is merely a new petition ... probably trying to take advantage of the cap.
Talk to company B's immigration lawyer (try to avoid the non-lawyers that may be in the HR department).
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There is nothing to transfer as you are not in H-1b status. Your new employer can file an H-1B petition.
Your employer needs to retain an experienced immigration lawyer to review all the facts, advise them, and handle the case. Your employer can find one through http://www.ailalawyer.com.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.