First saw this the day before: http://www.pentaxforums.com/news/tokina-confirms-pentax-full-frame-under-development.html
And then this today: http://www.pentaxforums.com/forums/pentax-news-rumors/214117-pentax-confirms-full-frame-cp-inteview-pentax-forums.html
As PF is close to the official Pentax second to nothing (they should be even closer to Pentax than DPR by now), their promulgated rumours should be trusted!
But the problem is, as Adam said, it is not a problem of whether a FF is being developed or not, it's now only a problem of "when". It may still take longer than expected for a Pentax FF body and system to come!
In the meantime, I have been preparing for a Pentax FF system for yet too long for my "recent" Pentax lens investment in the last several years. Unfortunately, it still does not happen up till now, and still no any outsider knows *when* can it finally come, at least it should not be in the near future, after all! >:-(