We've announced there will be new professions a few times already. As noted, the Assassin is the first to be officially named. You'll just have to wait and see on the rest.
There was a Chapter 2 speculation thread a while back, albeit lost in the ruckus over more recent developments. It's located here: http://www.guildwarsguru.com/forum/s...ad.php?t=77120
Otherwise, just wait for official info. Closed.