hotox's "INS's Answer on different A# for I-485 and I-140"

Hotox, I hope you can see this post. First thank you for your info sharing with us. I have a similar situation, and I sent an letter request combine two A number from 485 and 140 as well(still waiting for response).
I have 2 questions would like to ask you:
1) How long did you get the response from INS after sending your letter?
2) Is INS going to combine approved 140 with 485 (which is based on another pending 140, e.g NIW) automatically, or we have to submit another 485?
What does it mean that"information will be interfiled with the pending application/petition for review "?

Or if anyone can answer these qurstions would be greatly appreciate.

Thank you so much!