A new addition to the household

We're adopting another cat, and will be able to pick him up in about 1.5 hours (he needs to get an AVID chip and they can't do that until 2, for whatever reason). Whee :)
I think he and Mojo will get along, or at least tolerate each other. They've already met at the shelter and seemed ok with each other, but things might (and will likely) be different on home turf, since we've had Mojo for almost 2 years now. The house is certainly big enough to provide both with hidey spaces and such. The new guy is about 10 months, while Mojo is around 3 years old.
Gah, I'm nervous. :)