That's a pretty old picture. (I still want to see one of him in the original 7th Doctor costume he owns, that he wears to play DW with his kids in.) And there's a big gulf between "wants to do it" and "has commitments to massive movie franchise until the end of next year".
Anniversary special on November 23rd and then the Christmas Special. We don't know when series 8 starts.
I imagine Jackson will be busy with Hobbit-related work, whether formal post-production or publicity, until the last film comes out in December 2014. So that would rule out his working on series 8, if the reports are accurate about that filming from October 2013 to August 2014. But we can rule that out anyway: directors for the upcoming filming will be in place already, not at the "I think it's entirely possible" stage. If the annual production schedule is back on track and series 9 starts in October 2014, Jackson could plausibly be asked to direct something from the second half of that series. That's assuming Moffat is correct in judging that he's serious about it, and that any other wrinkles could be worked out. Even if Jackson genuinely wants to do Doctor Who, he's got a bunch of other film projects in development that might have to take precedence.
Yeah August/September 2014 has been rumored for quite sometime for series 8 to start airing There's just no way to get 7 episodes out before Easter 2014 and also promote it properly. A full season by Summer 2014 is nearly impossible
Adding fuel to the rumor mill, Peter Jackson posted this video on his Facebook page, where he teases the possibility of directing while playfully mocking Moffat's scripts. Features a few special guests. I'm not sure if the link will work since I'm posting from my phone but you can find the video by looking up his page. You don't need to be a member to view it.
For those not on Facebook, here's the video on YouTube (though the title of that upload might be a misinterpretation, as it's not a confirmation at all).
Watched the video. Holy sh*t! Not only that, people are saying he's got the silmarillion with pages marked on his desk.
Which is the big clue that the whole thing's a joke. Not only couldn't you make a film of it, Christopher Tolkien will never give the rights to anyone to try to do so.
I actually hope Jackson will direct or write an episode. A 4 hour episode will really add to the running time of a season.