That's AWESOME! When do you get to bring him home?
When we adopted our second we took about a week to let them sniff each other before introducing. We kept Bernie in a bathroom & would let them see each other everyday for a little while. Then about a week later we let him out. Squeak hissed @ him a couple times & then that was it. The main reason for keeping them apart was to make sure if Bernie had caught anything from the humane society he couldn't pass it to Squeak.
Good luck w/ this new little guy! You are going to have so much fun!!!!