Here’s that video that someone made gifs of but I never saw it on youtube, so have one! Anyway, apparently it’s from a free rental special DVD from Tsutaya to coincide with the movie that came out today as well as BW2 that includes this “full version” of the BW2 Special Movie, as part of their kid’s campaign. Kids can get a stamp card and get prizes with stamps.
The cool big thing is of course, the extra battle scene with Mei at Cheren’s gym, but there’s also subtle changes, such as the BGM and I believe (but I need to rewatch the first one) there were a few line added?
No lines besides the Cheren and Mei battle were added (i have the entire script for the original basically memorized :V).