Elf

You'll probably get conflicting answers on that, but my suggestion would be to save it for the interview unless including it with the application would stop you worrying too much between now and your interview date.

We also did AOS from F-1, and on our attorney's advice we waited and brought most of our evidence of bona-fide marriage to the interview. The IO flipped through our photographs and spent a couple of minutes looking at our inch-thick file of important documents (i.e. joint bank statements, joint insurances etc) but didn't even open the two files of "other evidence" I'd compiled. Our attorney had recommended that we bring evidence that I'd attended the grad school on my I-20 while in F-1 status, but the IO didn't ask for that either. Our interview only took about 15 minutes, the IO told us she was "recommending us for approval", our status was updated to "card/document production" two weeks later. and I had my GC in my hand a week after that.

Congratulations. When I check USCIS online, I get this message:

On September 22, 2015, we registered your permanent resident status and mailed you a Welcome Notice for Receipt Number xxx. Please follow the instructions in the notice. Your new permanent resident card should arrive by November 21, 2015, after this registration or after you complete any ADIT processing referred to in the welcome notice, whichever is later.

Did others who got approved in their interview get the same message?

Yep, that's exactly how my case status updated when they mailed the Welcome Notice. We were "recommended for approval" at the interview and case status updated to approved two weeks later.

We did not receive an email like others have said, and I do not understand why we need to go through ADIT processing which I understand is more fingerprinting and another round of photos. We already did the Biometrics - in fact, Joaquin has submitted 3 sets of fingerprints and photos already. So now, they need a 4th set???

Anyone know why we got this message?

It's just the standard wording they use for all approvals, regardless of whether ADIT processing is required. Your Welcome Notice should arrive within about a week and won't include any mention of ADIT processing. My GC was mailed the day I received the Welcome Notice and arrived in the mail two days later. Congrats, it's almost over!