My opinions on each of the movies:
Accel's movie: I personally think Toei are giving Ryu his own movie because of the supposed success of Episode Yellow from the Cho Den-O Trilogy. Of course, that doesn't mean I won't watch it. It will be good to see Ryu getting some more development and hopefully, some more looking into his past. The number one thing I am looking forward to seeing is Accel's new Accel Booster form. I'm sure it'll be awesome to see.
Eternal's movie: Now this I find odd. I can understand a movie focusing on a secondary Kamen Rider, but to have one focusing on a movie-exclusive Rider from a previous movie? Is it just me or is Toei really trying too hard to boost their ratings? I mean, other movie-only Riders didn't get an origin movie, so what makes Eternal so special? Although, seeing Rin Takanashi, A.K.A Shinken Pink, might be worth watching.