I hope you like your single-player MW3 because that's all you'll be doing after 8 a.m. Pacific tomorrow on that PS Triple. LOLOLOL.
I'm kidding, and actually "some users may be able to play online during the maintenance," says Sony. You'll also be able to collect Trophies, though they won't be updated on your profile until the network is back up.
On November 17th, from 8 a.m to about 10 p.m. Sony will be performing routine scheduled maintenance. This means that account maintenance and registration will be down, as will the PlayStation Store.
Wow. Why do they need 14 hours of daytime maintenance time?