Today SGK has released what they call PS3 CFW 4.31.1 which is under development with details on the new PlayStation 3 Custom Firmware below.
To quote, roughly translated: Hi all, What better than to come back with this kind of news!
Our friend and SGK developer releases today the result of hard work. Indeed, in the shadow he worked to bring us a CFW with features interesting and not yet seen the new CFW 4.xx
The basis of this CFW is based on the REX Rebug CFW 4.21 which is the most stable and most successful of the moment. He added the Debug menu and Rebug Package Manager for our greatest pleasure.
Some files from firmware 4.30 which ensures compatibility for the latest keysets. So you can play your backups favorites without a patch or fix. 4.31 is a spoof includes access to PSN and avoid unintended updates.
•Debug menu displayed in setting
•Rebug package added
•Implementation of parameters Rex 4.21.1 Rebug cfw
•Lv1 Lv2 and recompiled
•Patched Peek & Poke
•Coldboot game replaced
•Theme changed from dynamic watch dogs
•More corrections …