And our question is: how is this going to work? Obviously the ghouls won't actually work as pets as in the way Hunter or Warlock pets work, but surely they'll have a little more control implemented than the Druid's treants or the Priest's shadowfiends, right? As far as I can remember, we've never actually controlled multiple pets before -- are we going to have one bar to control all three with, or will we mark a target as they're summoned? It would seem that with a tanking class like the Death Knight, more focused pets would be a necessity in some cases.
Or maybe our ghouls will be as mindless as ever, and after we hit a button to summon, they'll just head for the closest thing that looks like it might have brains to eat. Hopefully the Death Knight's ghouls will be a bit more interesting than that (there was a rumor a while back that you'd be able to raise your fallen group members as ghouls, though I don't see that spell in the hands on), and if not, I guess there's always other Hero classes to improve upon the pet mechanics.