I love Terry Gilliam so I'm also looking forward to The Brothers Grimm. I think it's been moved around a few times already.
It's good to see that you've kept up with this thread; it's certainly being read. I'll try to mention a few key indie/foreign films since you've covered the bigger releases. June for now.

June 1

Or - My Treasure - Keren Yedaya (Israel): Winner of the Camera d'Or (Best first film) at Cannes last year.
Kino International

June 3

Milwaukee Minnesota - Allan Mindel (U.S.): Cast includes - Josh Brolin, Bruce Dern, Debra Monk, Randy Quaid.
Tartan Films

Pure - Gillies MacKinnon (U.K.): This one has played on Sundance Channel on a few occasions. Not bad at all.
Indican Pictures.

Rock School - Don Argott (U.S.): Documentary.
Picturehouse Films.

June 10

5x2 - François Ozon (France): From the director of the popular Swimming Pool.
Think Film.

The Adventures of Shark Boy and Lava Girl in 3-D - Robert Rodriguez (U.S.): From the director of Sin City.
Dimension.

Howl's Moving Castle - Hayao Miyazaki (Japan): From the director of Spirited Away.
Walt Disney.

June 17

Heights - Chris Terrio (U.S.): Looks like Crash.
Sony Pictures Classics.

Me and You and Everyone We Know - Miranda July (U.S.): Winner of the Camera d'Or (Best first film) at Cannes this year.
IFC Films.

My Summer of Love - Pawel Pawlikowski (U.K.): Won the award for Best British film earlier this year.
Focus Features.

June 24

The Bridge of San Luis Rey - Mary McGuckian (U.K./France): Cast includes - Kathy Bates, Gabriel Byrne, Géraldine Chaplin, Robert De Niro, Harvey Keitel.
Fine Line/New Line Cinema.

George A. Romero's Land of the Dead - George Romero (U.S.): Cast includes - Asia Argento, Simon Baker, Dennis Hopper, John Leguizamo.
Universal.

Lila Says - Ziad Doueiri (France): From the director of West Beirut.
Samuel Goldwyn.

March of the Penguins - Luc Jacquet (France): Documentary.
Warner Independent Pictures.

Rize - David LaChapelle (U.S.): Documentary.
Lion's Gate Films.

Wild Side - Sébastien Lifshitz (France): An award winner at Berlin last year.
Wellspring.

Yes - Sally Potter (U.K./U.S.): From the director of The Tango Lesson.
Sony Pictures Classics.