If I change my employer, given the recent changes to I-140 rules for revocation/withdrawal, can my H1-B be extended again for 3 years, with me providing only the LIN number (which can be verified for an approved I-140 on the USCIS website) towards H1-B transfer to my new employer? Do I strictly need to provide the I-140 approval notice to extend/transfer my H1-B to a new employer?

My Project with My Client will end soon and my employer doesn't have any further projects and asking me to go back to my home country (India) by end of this month. My Visa is valid till Aug 2017 with extension filed. So I am considering to resign on last day of the assignment. ( no new employer found yet).<br>
1) as per new Rule would I be getting the grace period till my I 94 expires i.e till Aug 2017? Is this correct? ( 60 days grace period rule) Also during this Grace period Can I apply for a Change of Status to another non immigrant Visa - F1? (change to a different nonimmigrant classification.) if yes and F1 filed after termination of employment, will this not be considered as timely filed which can result in problems in the future?<br>
2) if F1 is filed Should I start my classes before I94 expiry date or can I Start in September or should I wait till F1 is approved ( after 90 days from date of filing F1)?

Recently I got Consular visa, that my I-797 was approved without I-94 so I need to step out of the country to get H-1B visa stamped.
Got laid off from EMP A and took around 55 days for EMP B to file h-1 and now I’m with EMP C. Both I-797's from EMP B and EMP C, I got consular visa to step out for visa stamping.<br>
1. Usually, how much time I have to step out of US for stamping, if I go little after 3-4 weeks what’s the valid reason that I can give to Visa officer at interview time.<br>

2. How can I justify myself about the 55days of gap I have from EMP A to EMP B ( during the time I do not have H-1B status), my attorney suggested that I need to tell VO that “I was looking for a Job and my employer took time to file for H-1B “. I’m not sure whether I can say this. Can you suggest a valid reason to give VO.<br>

3. MY GC Perm Labor has approved and EMP C has applied for I-140 recently and it's still in processing status, during this situation If I get a full-time opportunity can I move with a new employer? OR I have to stay with current one until I get I-140 approved and then transfer with a new employer.