I'll try to keep this updated as I get new info. They took him back at 8:30, we got to go back with him while they put him under. He was actually excited to go and not scared at all so that was good. He got to take hit blanket and his "battle force 5" cars. He didn't fight the gas, and drifted off easily. Surgery is expected to last 6 hours, until 230 or so. We should be getting phone calls every hour or so, so I'll update as it goes on.
12:30 pm: Everything is going great, and they're getting close to finishing the actual surgery, but the process to close is about an hour. So as of now they're actually ahead of schedule, and we might be able to see him in ICU in about 2 hours!
2:00 pm: He's done! The surgeon said it could not have gone better! We're waiting for him to get up to ICU.