[DrillBIT]

There will be more than 12 characters (out of 51), including Gaimu, appearing in the NetCarddass game Kamen Rider Break Joker Booster Pack.

From amiami

Quote:

主人公をはじめ、「仮面ライダーウィザード後番組」 登場キャラクター１２体以上が参戦!!
全５１種中の１２体以上が「仮面ライダーウィザード」 の後番組より参戦!!
番組放送開始に合わせたタイムリーなラインナップ!!
大人気作品「仮面ライダー電王」 キャラクターも電撃参戦!!

Say if Toei is not going for MOTW and keeping 2 weeks per scenario, there are more than enough characters for the whole year.
There are already speculations about 12 Riders for the Gaimu project.

EDIT:
Did I post this in the wrong thread?