Is it going to support manifest v2 after it is phased out by Google or whoever is going to own Chrome?
Nope. And they're betting on their built-in AdBlock being a good replacement for uBlock, even though it's extremely basic, more so than uBlock Lite.
I made that switch quite a few years ago, got sick of dealing with extensions and configuring browsers. Vivaldi gives me enough out of the box to call it good.