I would personally hazard that Swordmasters, Sea Guard, and Reavers won't get conventional plastic kits with this release. It'd make more business sense to keep them exclusive. I imagine that they'll end up like the Deff Koptas in Assault on Black Reach. I get a strong feeling at least one of the Special infantry trio is going to be made plastic, more likely Phoenix Guard or White Lions than Swordmasters. A cavalry kit like Dragon Princes sounds possible too.
I'm just basing it off of what we've seen GW do in the past with Second Waves. Shadow Warriors seem an odd unit to be plastic and their current models aren't exactly bad, so I don't see them getting an update. Same goes for Eagles.