Not a fan of pre-paints, but they can be repainted, of course. If it does lead to a unpainted line I hope it is better quality than their current unpainted minis. Lots of mold shifts and loss of detail... but they are inexpensive, so I suppose that's the trade off.
I've never dug into 'Battles' product lines before (such as D&D Battles or Pathfinder Battles), are these collectible? I really am not trying to be negative here, I am honestly glad to hear there are minis coming out, but collectible generally means random and/or not being able to find what you're looking for (or buying a bunch of what you don't need to get what you do need), and/or grossly over-priced models (for what you get).