Just got back from seeing this with my roommate and I fucking loved it. I wasn't able to catch all the plot points, but aside from all the actions sequences (say what you will about Sakamoto's overuse of wirework, but the man knows how to direct action sequences) my favorite parts were as follows
[HIDE] -Satonaka fights in both her skirt and short shorts. Hottest fight scene ever.
-Ankh's return. I knew he was coming back, but I didn't know the details, so the scene itself was a great surprise. Really just seeing Ankh in general made me happy.
-Remember all the other medal sounds in the OOO driver? Well Kougami is busy working on creating/finding those and we actually get to see what they looked liked. A small thing I really appreciated.
-During the small W portion, Sho calls for Phillip, who as usual is too busy looking something up. Instead of getting mad though, he sizes up the Foundation X and then basically says, nevermind I can take these guys by myself, puts the W driver away, busts out the Lost driver and turns into Joker.
-Nadeshiko. She was just so goddamn cute, and she snapped a Dustard's neck! Gen had some really endearing moments with her.
-Gamou and Lem basically have a pissing contest with one another. Again I missed the details, but Lem somehow was trying to screw Gamou (Red Eyed Guy) over. Lem then reveals that his two cronies are mutants to try to intimidate Gamou, which Gamou responds by having Leo appear, and asking Lem if he really wants to find out how strong Zodiarts are. I'm probably not conveying how awesome this scene was, but I can't wait to see it once it's subbed in like a year.
-After Gentaro gets his heartbroken when he loses Nadeshiko, in a really touching/badass scene the rest of the club fights (we get some bike action from Kengo) the Dragon monster thing (sorry I can't remember his name), all the while giving Gentaro the encouragement he needs, and when he henshins they all stand behind him, do the countdown, and then all say Ucchu Kita together.
-Rockets states. Was a lot better than I though it would be. Really cool actually.
-Seeing all three (four) Neo-Heisei riders interact. Priceless and a tradition I hope the keep up for as long as they can. Also Phillip as the best line. After Gen called him and Sho sempai, he turns to Shotaro and says something to the effect of "Huh, it's crazy we are the Sempais now isn't it?". Also OOO Wonderful is officially in continuity. Good old W's production team keeping everything together (as best they can).
-Double just owning the Zodiarts (really showed how powerful those two have become).
-OOO combo changing into all his forms in rapid succession, after using the previous combo's finisher.
-Fourze using a bunch of Switches in tandum.
-the Legendary Riders all using their signatures kicks (with Nigo and Riderman using Rider Punch and Rope Arm respectively).
-Meteor. Really excited for him to appear in the show. He's totally Bruce Lee. Completes with sound effects and everything. Also his weapon is voiced by a white guy. Hearing it was very similar to the first time I hear Goseiknight's Cellular. In fact it actually might be the same guy now that I think about it.
-Also, no continuities errors this time round. This fits perfectly after today's Fourze's episode.
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So yeah. Easily the best of the three Movies Wars by a longshot.