Seems pretty clear to me at this point:

Instead of picking 5 cross-class skills, we'll now pick 5 cross-role skills in more or less the same interface. Skills will likely end up being the same or similar to what we have right now, biggest change being that you'll no longer have to level the respective jobs. Chances are, slots will be unlocked at a similar rate as now, too.

Or in other words: Big whoop over a relatively small change.