H1b status if quit job and move back to India with new employer

[Pal KS]

Hi There-

Background:-

I'm currently working in US on H1b visa. My H1b visa petition was initially approved in Sep 2014 and got it stamped in Jan 2015.

It was valid till sep 2017. I came to US in Apr 2017, only, on H1b and filed my extension in September. Extension is approved and now I have valid status till July 2020 (Visa stamped as well on my passport).

Now, I want to move back to India with new employer:

I want to know:

1. Can I come back to US in future if my new employer file counselor processing for petition transfer? and will it be Cap exempted?

2. What if my current employer withdraws/revoke petition? will it be still cap exempted

3. any other advise in this regard, to be taken care at my end before resigning from my current employer?

Thanks in Advance!

KPS