Looks like Rogues/Druids do not have any talent which improves stealth or the detection of stealthed units.

With the old talents, a Rogue/Druid would stealth as if they were 3 levels above you (or 4, if they were a Night Elf).

Not sure if all rogues/cats (or just rogues maybe) get the equivalent of the Subtlety talent built into stealth, or if stealth is less effective than previously.

AoE should knock the rogue out of stealth, if you can land it. Cloak might make them virtually immune to spells for a short duration, but that's the best you can do.

With an army, having 15 toons at one base is not ideal; if you were a smaller boxer, just having five at a flag/graveyard until it capped and then holding it, can be worthwhile for your team.