No Title
This is what I Would do :
1.)Join the new employer ASAP. --You can still change
jobs , even with the new employer, since you are past 485 Days.
2.)Ask the new employer, whether he will be willing to give
a employment letter --phrased \'blah blah\'.
3.)Be ready to ask another friend who can sponsor your H-1 in case of Dire Emergency.
4.)Basically, I do not foresee a problem in your case, you can join the new employer ASAP. Many of my friends have done so, and they have got their GC without an issue.
5.)There is a very strong chance that you would get a RFE, if you don\'t then that is your good "deeds", but if you do get a RFE, you have to prove that your current employment "description" is similar to what you have been doing in the past "in I-140 Letter".
6.)Contact the lawyer, get all documents, be in good contacts with them, because many a letters will be sent to them.
7.)Be in good contacts with your existing firm, try to be as pleasing as you can, "You know I want to be with you guys, but due to the economic condition, blah blah. I will rejoin you guys when I get a project through you.
8.)And remember, to file a new H-1 with the new company, even though they want you to work on EAD, because EAD has a expiry date.
My 2 cents, you are free to override any or all of my information.
Hope it helps.
Good Luck, and Good Job on finding a new project.