All talk, no show. Sure, he has had previous successes, but with all tweets he's posting, how will he have the time to develop his service? 
He will show us probably his final version of this idea. I guess there won't be any open beta tests. And I doubt he is the one behind development process.During his Megaupload times he had a company and employed over 150 people. He has brigade of developers at his disposal I assume.
Any idea when this concept will be live?
All we know from his tweets that Kim planned Bitcache to be released in 2017. No further details are known.