I've been wanting to hear this episode ever since the interruption-edit you made during last week's about it. X3
I have good feelings about this movie. So far:
-it's in 2-D animation
-it takes place during those 10 years between Buu and Uub
-it's not a retelling, but a brand new storyline
-Goku and Vegeta are on the promo art; and they're in base form
While I know it didn't actually happen, I feel like someone at Toei read my old posts and just made a check list from it; because everything so far about this movie is something that I have wanted and wished for years.

I loved the 2008 Jump Tour special; I am in agreement with all three of you about wanting something like that. The way the characters interacted with each other during that special was gold. I want to see Goku mess with Vegeta's mind some more; I never dreamed that would actually happen and when it did it was wonderful. In fact, I want to see more of the dynamic that went on between Goku, Vegeta, and Bulma in the 08 special.
Speaking of gold, the mental image of "everyone going ssj3 no matter who they are or if they aren't even saiyajin" was great. XD
Every time I see new Heroes art with more ssj3, all I can see is ssj3 Goku cosplaying as that character because I associate that adult ssj3 head/face with Goku since he's the only adult in the manga/anime who uses it.
Also, Goku in swimsuits made me laugh. XD The way he acted with the "special Kamesennin uniforms" when they were trying to fool Lunch makes me think he really wouldn't care as long as he can move easily in it. Vegeta'd care though. X3
Goku figures in a bunch of different costumes that have nothing to do with the series itself or even have nothing to do with his character could potentially be hilarious.
Yes to makaioshin as villains; I'd like to see the characters fight some bad guys who've got magical powers. That's one of the things that could make a battle conceivably difficult given the time frame it's taking place in. As long as it's
not Brolli again (I don't dislike him, it's just that he's already had 3 movies) I'm not too picky.
In terms of length, I say it'll be midway between Toei's shorter animated movies (Pretty Cure's are usually a little over an hour) and feature length (One Piece's are generally an hour and 45 minutes). I definitely want it to be longer than an hour and I think it has to be since this is a different situation than with all the older movies which were paired with something else.
Tuesday was insane for me. I don't think I've been off and on these forums that much during one single day since the whole LAM speculation. Tomorrow's Tuesday I hope has it's own chunk of new movie news however, since that's typically the day Shounen Jump gets leaked. I don't know if they'll have news the week right after, but here's hoping.
I'm certain the whole inclusion of FOX is just leftovers from the DBE project; Toei may not have even known back in 07 that they were going to do a 2-D animated movie five years down the road. It probably is a funding thing. Of that I am not worried.
I thought of the three recent animated specials, that the Jump 08 special was most smoothly-animated, so I'd like to have animators from that team return. Also more animation from Mr. Nakatsuru.