As you should already know, firmware 2.35 is now available for download. On the official Playstation Blog, where the news has erupted, user stlthriot asked in a comment if the new firmware would fix GTA IV.
A staff member replied:
"I just want to clarify that this upcoming firmware update isn't related to GTA IV. For those of you who may still have an issue playing the game on your PS3, we have identified a solution that should resolve the issue. You can contact SCEA Consumer Services for support - their contact info and hours of service, as well as more information on this issue, are available in our Knowledge Center (http://playstation.custhelp.com/)."