A divine controller is somewhat more plausible, and though there's a decent chance there is one in PHB2, I have no idea what it is; no existing 3.5 class really qualifies (though some cleric and druid builds did).
Really, if you go through the power sources listed in the PH1
martial - most likely will never get a controller
Probably right, I can't think of one...
divine - could easily have no striker or no controller
Most likely there will be, since there's 8 classes in the PHB and 2 of them are arcane, the other 6 can't all be primal. And there's certainly room for concepts such as Inquisitor (striker) and Theurge (controller). Besides who's going to get powers like Destruction or Slay Living?
arcane - only power source known to have a 'full set'
primal - probably gets a 'full set'
elemental - probably doesn't have a leader
Elemental hasn't really been defined, or even distinguished from primal. But I could easily see there being some class that calls out/enhances the elemental nature of their allies.
psionic - probably doesn't have a leader (the Complete Psi Ardent was very forced)
There's quite a lot of room and concept for a psionic leader. The ardent wasn't good since they took away half of it's abilities and made it the Divine Mind. Also you could so easily throw some telepathic powers, and ever fan-made 'hivemind' concept on to the ardent and you'll have your psionic leader.
ki - again, probably doesn't have a leader, and might not have a controller (even Street Fighter II/Tome of Battle desert wind style ki powers seem more single-target than area of effect)
I'm really at a loss at what the other classes would be, other than monk. They could reinstate the ToB classes, and controller would be the most difficult to come up with.
Making the Wu Jen part of that power source would be really forced and too much about the wrong type of cultural pidgeon-holing, as Wu Jen (Chinese for 'Witch Person') is clearly a class that should be elemental or primal.
Unless there's the plan on bringing back some of the Incarnum classes. In which case the Incarnate could be a ki controller.
shadow - might have a complete set, but could easily be missing a defender (hexblade works, but is a bit redundant)
I have a harder time envisioning a Shadow-leader.
Sure Hexblade might be redundant in that it could overlap with the Warlock (since it would be all about cursing) and Swordmage, but I think there's plenty of ways to make a class around using curses to be a defender.
As for the other shadow classes, I suspect it would be Shadowcaster (controller) as a necromancer/illusionist and Ninja (striker).