In my opinion, I think that because we
can edit the meshes of the battle scenes, we definately
should. I think retexturings, as good as they are, should really go along with a brand new mesh if possible, otherwise the textures will look a bit...out of place on the old models?
Take this for example. However good the new textures may be, you'll never be able to get around the fact that that fence thing definately looks like a box with some transparency, and the bars look totally and completely 2D. The only exception is the WMRP, And this is because it's impossible to edit the model - I think it'd look way better with a nice new entire model for the whole map. Anyway, WMRP aside, I'd be against just adding new textures straight onto the old battle scenes, but that's just me.