It'll be in full release. It is a seemingly odd thing to not include, but then again I have no experience in making code of any kind work, so what do I know?
I dunno, 80% of people lurk and probably 15% of people comment and 5% actually post or something I would imagine (made up the numbers but that'd be my guess).
So getting browsing and commenting out caters to 95% of people, in a time where being the 'first to market' out of the big reddit android clients is probably quite a big deal, that makes a lot of sense rather than delaying release until posting works.