It was already stated that there will be new skills added, in addition to 1 skill for each class obtainable when you specialize (3 maximum). What those new skills and specialist skills are and will do, you'll probably not find out until much closer to early access or even just when the patch notes go live during maintenance. It's highly unlikely that the existing skills will be adjusted, though they might make some of them more useable as some are currently complete junk (the Brand of "element" ones for example).