People convinced they need full frame this year should buy into other already existing systems without regret. You might want to see if these rumors about more full frame cameras from Nikon or Sony come true, first, though. A cheap Nikon D600 will have to be attractive for all you people who have been hanging on the full frame fence for a long time, waiting for the motivation to jump away from Pentax. And a full frame Sony A99 could be pretty cool.
As for me, I'm having fun shooting my FA Limiteds on film. Would I love a Pentax full frame camera? Absolutely! I'd pre-order two the day they announced it. But at this point I don't feel like I need full frame. I'd prefer to get better with what I own first. I might pick up a full frame system next year after the big three show their hands this year.
Whatever happens I think this fall is going to be pretty fun for Pentax users as long as they don't get their hopes up for anything specific. I predict there will be at least one big camera release (likely the APS-C successor to the K-5 but who knows), probably hints of camera releases coming next year, some more lenses for the Q, the K-01 and finally the arrival of the 560 lens, plus an overall sense of where Ricoh wants to take the brand. (Remember, they'll only have owned the brand one year as of next October). This will lead to more stuff in the spring, which is where I'd guess the FF camera would arrive if it does.
Since I'm a Ricoh GXR owner, I'm also anxious to see if they come up with anything cool for that system as well. A K-mount module? Some A16 prime units? A new EVF? The promise of new Ricoh releases is keeping me from buying a lot of these goodies from other companies that were released this year. Like I said, it should be fun