4/1 UPDATE Okay thanks for your patience. I can't scan anything but I can translate some of the info. Here's what I was able to pick up:
It's about 95 minutes long and it is being toted as a "Special Animation". This is because it's only going to be playing in Cinema Tierjyu (sp?) in Odaiba Tokyo during the month of May. It's also a special collaboration between Fuji Terebi and Terebi Asahi which own rights to OP and Bo-bobo respectively.
The title of the film is "Uchira no Daibo-ken" or 'Our Grand Adventure' with the 'bo-' being used from Bo-bobo's title.
The film is playing ONLY during May and is going to be released quickly onto DVD.
Yes, there is a Bo-bobo skull-and-crossbones but no indication of whether they'll be a pirate crew or not.
The special guest voice actor appears to be some kind of comedian called Guitar Samurai. Apparently he's playing the role of a character called Ponzu (sp?).
There will be a chance to play GB Rush and (wait for iiiiit) a JUMP Super Stars demo at Fuji Terebi HQ also in Odaiba.
That's all for now. If I can get a hold of a scanner I'll post it ASAP unless someone else gets it first.