What I find worrisome is that they seem to be coming at multiclassing from the point of view of encouraging synergistic comboes, like say Barbarian and Fighter-two very similar archetypes, and discouraging dissimilar archetypes from combining, which is exactly the opposite of what I want.
Me, I don't care if Barbarian and Fighter are even allowed. A straight class Barbarian, A straight class Fighter, and a multiclass Fighter/Barbarian all look pretty much exactly alike everywhere but the character sheet. I want multiclassing to allow me to combine things like Fighter and Wizard, or Rogue and Cleric.