Olgar Shiverstone
Legend
My prediction: 2 classes for each role.
Defender: fighter, paladin
Leader: cleric, warlord
Controller: wizard, druid
Striker: Rogue, ranger
Prediction: barbarian, bard, and monk get subsumed in feat/talent paths; sorcerer shows up looking like a cross between the current corcerer & warlock in PHB 2. Wizard & sorcerer have too much current baggage so they are likely to be very similar (and it wouldn't make much sense to double them up on the controller role). The druid, if you ignore his divine baggage, has always had battlefield controlling spells between entangles, summons, fire & lightning, etc. Druid is a nice complement to wizard: similar controller abilities but very different flavor.
Defender: fighter, paladin
Leader: cleric, warlord
Controller: wizard, druid
Striker: Rogue, ranger
Prediction: barbarian, bard, and monk get subsumed in feat/talent paths; sorcerer shows up looking like a cross between the current corcerer & warlock in PHB 2. Wizard & sorcerer have too much current baggage so they are likely to be very similar (and it wouldn't make much sense to double them up on the controller role). The druid, if you ignore his divine baggage, has always had battlefield controlling spells between entangles, summons, fire & lightning, etc. Druid is a nice complement to wizard: similar controller abilities but very different flavor.