Twisted Metal Black won’t be online. BUT, PS2.IGN is reporting that Sony will be releasing an add-on pack later on this year that will allow you to play TM:B online.
No details have been given yet, but it is know that you will have to have the original Twisted Metal : Black in order to use it. It will probably function like the Grand Theft Auto add on pack. With it, you started the game with the add on pack and then swapped the original in to play. Kinda annoying, but if it will allow me to play online, I don’t care. Hopefully there will be an option to allow you to load it on the hard drive.
The current title for the add-on is Twisted Metal Online.