I believe that the general rule is once the show hits 100 episodes, it can hit syndication, but I think it only applies to broadcast TV, not cable (meaning that it's possible that FX can start showing Angel episodes). So...if this is the final season of Angel (it still hasn't been picked up for next season), we may never see it in syndication.
It should still end up on DVD though. Season 2 comes out in September and, I would assume, that trend will continue with another set coming out every 6 months - much like Buffy.