As far as anyone knows, Sony is working to create a new 'Definitive Set' for bluray.
The original film will be rescanned for HD properly instead of upscaled, using the Extended edition print. It's cleaner, clearer, has less of the blue filter and much improved audio over the theatrical already.
They'll be removing more of the blue filter and returning more of the film to original colour, cleaning up the visual and audio distortions, making digital edits to the Lycans in limited scenes to improve the old CGI and remixing some of the original OST and songs.
They want to use the Rise of the Lycans footage for flashbacks to make it more consistant, there are rumours of new credits and added snippets of scenes and songs missing from the original.
Evolution will be getting the same clean up, colour restoration and HD print, but that's probably as much as they'll do.
Rise of the Lycans won't be touched and a couple of rumours of Awakening getting an extended 102 minute cut over the 95 or so current one.
