Hmmm.. I would not count on an official Rebug update.
If you wish Cobra 8.3 on Rebug REX 4.84, you need to install a Rebug REX 4.84.2 PUP repacked with the appropriate 4. 84 REX Cobra files which can be found in Nat's repo already compiled (and tested?).
https://github.com/Evilnat/Cobra-PS3
Pup repacking can be done with PUADGUI (also from Evilnat).
As to PSN, it is all up to you.
Using Rebug 4.84 to connect to PSN is recommended against, at least until new version spoofing tools are released.
On 4.88 CFW, using PSN to game online can be risky, it depends on the games & on how you play them, if you cheat and/or mod game files of gta5/bo2 etc.., server admins will eventually detect it & you can count on getting banned & losing both PSN account & idps.
Also, I wouldn't take idps spoofing lightly, the console id can be changed BUT don't think that it's done with no possible risks & caveats, no matter what you may have been told by kids spending their time messing with cod/bo2/gta5 servers & getting banned all the time as a result.
And keep in mind that a spare idps should ideally be extracted from a dead console, not only because that's the only way to know what console model it comes from (in theory an idps spoof should use an idps from the same console model) but also because the chances of finding trustworthy idps resellers are more or less akin to those of finding the holy grail, lol.