word of caution
I agree with Moulin. Is this a desi consulting outfit ( by any name) run by desis? Usually, american owned/operated companies would want to play by rules for their own safety and for the lack of anything requiring them to do anything otherwise, and would probably not agree wit give you a letter of employment after you are laid off.
If this is a desi outfit, why are they eager to lay you off, they can place you on unpaid leave, right? It says in the Hi discussions on lawyer sites that they need not pay an H1 guy if he/she is taking unpaid leave for india trips, visiting(touristily) US, etc, caring for a spouse, whatnot.
So, unless you know the boss very very well, (and know his/her parents and loved ones and where they live etc in India
- that close ) be very cautious about trusting such promises ( about giving letter etc) In the ISN bulletinboard there was the story of a guy (actualposting in first person) who went to INdia on CP, after a few months on bench, and the employer informed the consulate that he had been laid off while he was in India, and thus he was denied GC, H1 cancelled with prejudice etc - Also, know that if so rejected, you will find it very hard to get even an NIV later on since you have already shown your intent to immigrate by this application. Worse, it will even save your employer the dough to fly you back home if he lays you off in US.
I did nto say this to scare you or make you paranoid, but just to make sure that you should not trust someone who is telling you they woudl bend rules for you that wasily. This is US, and their business practice doesnot allow for any such favours, so please be very careful.