We don't even know if we can still unlearn pre-rec's at all and have skills still work after the change. Right now you can, the skills will go "grey" and they still work, but Nate said in a previous chat he had not made up his mind if he was going to allow this to continue after the skill change, it might be that they "grey" skills no longer work after the patch. He did say that yes all training requirements will have to be met when doing this respec, so to get these nifty tier 5 skills unlocked you'll need 85 points in the tree. And then after you put 10 points in the teir 5 that will only leave you 5 training points left until you use trophies to unlearn some skills in the tree. Or at least that was my understanding of it.