A few hours later, a preview for the ER PV was aired (you can watch it here, hope it takes a while before it's removed) and we finally have a release date for the ER single: July 25th. And the single is by the Eito Rangers, not Kanjani8! XD They're debuting, just like Subaru said weeks ago on Subaraji. XD

Teichiku's website has been updated with the tracklists. We'll have three versions:
Limited A (TECI-833), ¥1,470 (Digipack)
CD:
01. ER
02. 雨のち晴れ (Ame nochi hare - Rain, and then good weather)
DVD: ER PV (Lipsynch Version) + Making of
Limited B (TECI-834), ¥1,470 (Digipack)
CD:
01. ER
02. ∞レンジャー (our old and known Eito Ranger's Theme!)
DVD: ER PV (Catalogue Version)
+ Reversible Mini-poster
Regular (TECI-835), ¥1,000
CD
01. ER
02. 雨のち晴れ
03. ∞レンジャー
04. ER(オリジナル・カラオケ) (Original Karaoke)
05. 雨のち晴れ(オリジナル・カラオケ) (Original Karaoke)
06. ∞レンジャー(オリジナル・カラオケ) (Original Karaoke)
First Press Bonus: Eito Rangers Catalogue 2035 (16 pages)
And apparently all of them will come with a paper thingy / code just like in Ai Deshita, so people will be able to ballot for the special 8/8 event. Good luck to everyone who's in Japan!! It surely will be something awesome!! :)
I'm anxious for the performances and hoping for some craziness, haha!! Way to go, Eito! :)
Pre-order (thanks everyone for the links!):
Amazon.jp: LE-A | LE-B | RE
CD Japan: LE-A | LE-B | RE
HMV: LE-A | LE-B | RE
YesAsia: LE-A | LE-B | RE