I've read of this as an option. A lot of GMs might be leery of it; how easy is it to reskin as Archangel heritage? Or Modron heritage? Or Slaad heritage if they're back as the CN archetypes?
For instance, a Bard / Warlock type might have a Lillend in there somewhere.
Haven't seen the PH yet myself, but my impression so far is that most subclasses look like they'd be incredibly easy to alter to fit. Build your own storm/fire sorcerer, or shadow warlock, or whatever.
Actually I was going to do this as well. Probably not reskin but just create a new pact. Something is angels or celestials, and summoning. I really liked the 4e invoker, would probably do that with the warlock and a pact.