http://insidetv.ew.com/2013/03/21/doctor-who-peter-jackson-dalek-matt-smith/ It'll be split into three parts, three hours long each, etc etc
No, they've already announced who's directing the 50th-anniversary episode. Plus, at the time that the anniversary episode is filming in April, Jackson will still be working on prep for the final shooting block of The Hobbit.
w00t! I'm all for this... and it'll only be an hour long. The extended edition will be fourteen and a half.
He's eccentric, not mad. * *(to quote Anthony Head in the Radio 4 sitcom Cabin Pressure, also starring Benedict Cumberbatch).