Question about the upcoming mode nexus blitz

I really hope it gets released, and I anticipate that moment as that mode might bring finally some more fun into league (normal games are getting frustrating i am enjoying aram more than ever, this season is weird).

However I would like to ask, wether in the full release, we will be able to pick champions or have randoms as in aram. Right now in PBE you can (as much as I understand) and i hope very much this doesnt change, as I could have shorter more funny games with champs I like. Any info on that?