So what I do know now is that Etan Cohen, writer of Tropic Thunder has written a script and shooting will begin next month with Will Smith and Tommy Lee Jones reuniting as Agent J and K with Josh Brolin set to play a young version of Agent K and Jemaine Clement set to be MIB 3's villain. The film is due to be released in 3D in 2012.
I even found a teaser trailer featuring Will Smith. Check it:
As for the Spider-Man reboot, Marc Webb of (500) Days of Summer has been hired as director along with Andrew Garfield of The Imaginaruim Of Doctor Parnassus set to play Peter Parker.
2011 and 2012 might suck really bad.