Tweet is dated 8:17 PM - 31 Mar 2017 yesterday @evilsperm of Team Rebug sent word to JailbreakMe PS4 4.0x exploit developer qwertyoruiopz inviting him to join their private PS4Dev channel to share information privately.
Here's what the Tweet states, to quote: "@qwertyoruiopz we would like to extend an invite to our private PS4DEV chan and share some knowledge, shoot me a DM for more info. ^^ rebug"
When asked earlier today, qwertyoruiopz has yet to reply on the invitation publicly but hopefully they decide to collaborate in some capacity.
Keep in mind at this point it's just an invitation for qwertyoruiopz to join Team Rebug's PS4Dev channel to talk, and if they decide to exchange knowledge among one another it wouldn't necessarily mean a new PlayStation 4 jailbreak or PS4 CFW would result.
Cheers to @mcmrc1 for the heads up in the PSXHAX Shoutbox!