You didn't hear it from Adobe - which is all that matters: and Adobe doesn't pre-announce new releases.
The latest word is: Adobe has announced and delivered 5.7.1. Anything beyond that is just somebody guessing and hoping.
Whats the latest word on Lightroom? last I heard it was coming out early March.
As others have suggested, you have heard a rumor which had no credibility even before March.
Do yourself a favor and do not listen to any rumors. If you want to know when Lightroom is coming out, then be patient and you will find out at the same time as everyone else in this forum.
If you subscribe to Creative Cloud or Photography Plan, you will be first to get it.