Thanks for the update! Do you think I should give up hope on X58 support happening anytime soon? And by "soon" I mean before the next Intel Haswell CPU's are released (speculated March-June 2013 last I read)?
Can't really give much but a personal opinion but since thats what you asked for here goes.
IMO, Its going to be one of the later RST drivers that enables it if we do see it. They had huge issues with the 11.5 memory leaks (advised users to revert to previous versions). Guessing the current RST 11.6 they had their hands full just coming out with something stable to release on the rush. 12.0 beta also has the memory leak so its my hope that the next 12.xx that comes out will have both that solution carried over from the working 11.6, from there they can start working on adding things if they so choose...
I don't think people realize how this is abused by vendors to sell new hardware. A buddy of mine recently replaced 15 machines in a native school lab; he told me specifically this. "We updated the BIOS for the board and it still wouldn't see the new drives, after that didn't work we just assumed it wasn't possible with that old board to use the new drives so all of the machines were replaced". In terms of sales kick backs as a reference provider for the controller on the new boards, that's +15 revenue for Intel, and 100% unnecessary. Those machines had P5E boards... after showing him this thread i modded a P5E BIOS with the current OROM and sure enough, detected the drives on first POST. Sadly they were already sold the new units, and despite the fact it worked the modded BIOS would have been unusable in their situation in terms of warantee.
I can't see Intel overlooking this in terms or reduced sales, they flat out know that many of the new drives aren't supported by the old OROMS and use it as a way to trick users into unnecessary upgrades, and the vendor companies choose to play along with it by not updating the OROMs. IMO they will use the addition of TRIM support to sell their new controllers and try to use that to coax users to upgrade on those terms alone since many of the new boards don't offer more than 2 of the SATA III ports integrated yet they try to sell them with TRIM support instead.
Along those lines, my best guess would be that if we will see TRIM support for the X58+, If we see it, maybe half way through 2013 after this first crop of integrated controllers are set to be replaced with the next generation, and the addition of TRIM support wont be as much of a selling point since it has already been around for half a year + and they have milked it for all its worth. At this time they may try push controller that handles 4+ SATAIII ports instead, we can only hope.
Thats my 2 bits anyways...