To extend I 94 or file new petition?

Why don't you ask the attorney who processed all of this for you instead of complete strangers on a blog? Your answers are on the I-797 approval...

Hi. I am a LPR. My wife is a British citizen and now here in visa waiver. Our I-130 has already been approved. what next?

I am surprised she was admitted under these facts but to answer your question that depends on her priority date and when she entered the US. You...

Please ask your current attorney instead of strangers in a blog.

I Applied for my i130 and i485 in november, i havent received anything from the USCIS,

Schedule an INFOPASS appointment at the local district office.

The only Identification Card that I have is my employment authorization card, will I be able to travel to Las Vegas by airplane?

You should take your EAD and get a drivers license. Wouldn't that make sense?

Green Card for my future wife

No it is not true but there are several important issues you are not aware of, judging by your question. You must at least talk to a Board...

I am in India and my I-140 has been filed (Premium processing). Need to know meaning of the approval status mentioned below--

Perhaps you should ask your attorney. It would require a review of your entire file(s) to answer this question since you are asking about an I-140...

How long it will take after submit affidavit of support

There is no way to answer this question without much more information about the case.

Will i be rejected on my greencard interview?

There is no way to answer these questions without knowing much more about the case and reviewing the documents submitted to CIS and the NVC.

Forgot to drop I-94 while leaving US.

Leaving your I-94 would not have helped anyway. You can prove the one year by stamps in your passport or proof of employment, etc. Did you ask...