They've added Heroes? I've only seen the initial Elites they put in. Admittedly I haven't checked the Rogue Trader store in about a week. EDIT: Yeah I'm not seeing Heroes yet in my store.
So not sure if this has been answered but I've heard that they will eventually try to add all the classes of each factions codex's in eventually, and at that point what benefit is Eldar being limited specialists with more classes going to be?
Well Eldar have ridiculously cool classes like Warp Spiders, uncomparible to any other factions troops. We have more of an edge in raw ability versus versatility.
Pretty much this. Scout and Kommando classes are the only two units I can think of that don't come with a lot of specialization, restrictions or aren't a simple wargear tweak. Actually it's highly likely they'll roll Tankbustas/Flashgitz into the Loota class much like the Storm Boy and 'Ard Boy share an EC class, distinguished by their different loadout restrictions. Maybe if they add Squigs and Gretchin it would get interesting but that's still only a max of 2 classes ... Odd ... Smelly classes. I want one Expanding the Chaos units is more challenging I guess: They won't add Cultists anytime soon but the 4 god-dedicated troopers and Possessed class are planned for inclusion at some point. Though they're awesome they are extremely limited in wargear and customization, almost as much as Aspects. They could even be built from a single new class or as a specialization branch of the existing ones *shrug*. That really only leaves the Mutilators, Obliterators and Warp Talons who will surely end up as Elites with the Terminators.