My understanding is that the team is split on whether they want to keep multiclassing at all, so yes they are absolutely wanting to gauge the popularity of various alternatives. (And I say that as someone who personally hopes they do keep multiclassing in the game.)
I've posted on this second part before, but in case you've never seen the idea I'll give you a quick summary (it would have to be fit for some things but could work):Very few in my games ever MC. I think it is more the way the powers of each class and the ASIs are structured that make it feel like you are more penalized than in other editions. The fighter wants to get to 5th level to get 2 attacks while the mage wants fireball and so on. Do you wait until after 5th level to MC or can you grab a feat that lets you do some things.
I would like to see a better 3rd level path system where you get some powers of other classes. I may have an idea for a thief/wizard and find the thief path limits me to enchantment spells or there is no wizard path that lets me gain a bit fighting or thief stuff. Most of the paths work ok, but could be better.
That's what I thought about Pathfinder.I do think they make it easier to run a game with no multiclassing (and there are pro to that beyond simplicity), but I doubt they try and tell people "NO MORE MULTICLASSING!" They'll never remove it as an option
Yes"UA feats, are they trying to allow people to not have to multiclass to get class abilities?"
That is very clearly and explicitly what many of those feats do, so... yes?
Am I missing some implied part of this question?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.