It appear that your NIW is approved earlier. is that correct? If so...
yes Sagn, many of us NIW approved and due to retrogression, applied for EA, now PP.
1. If you apply pp for EB1-EA and also if it get approved, how you will adjust your previously submitted I-485? Do you know anything about that? In this case, do you think your I-485 will be considerd with EB1-EA priority date or the NIW priority date? or do you need to submit new I-485 again for the EB1-EA?
At least I have seen few approvals of relinking the I485 previously linked to NIW to the currently approved EA. Yes if relinking works you get the old priority date. you do not have to submit a new 485.
2. If you apply pp for EB1-EA and if it get rejected (hopefully not) do you think that will have any effect on your previously approved NIW-140, and pending I-485?
They are separate NIW and EB1 EA, unless you ask them to relink, they remain separate. and your NIW is valid and 485 remain attached ot that application.
3. If you used/applied/plan to apply EAD (assume even if you are not) based on previuosly approved NIW, do you think you have to reapply the EAD for the expected approved-pp-EB1-EA.
EAD is issued based on your 485, so I do not see the role of 140 anywhere.
4. If the pp for EB1-EA get approved in next 2 weeks, what is your next step?
Send a request to relink the 485 to currently apprved 140.
4. Any other precautions with similar situations?
I do not see any.
Expertise help please...
Sagn