Not really.
It was from a guy who got an interview with Bandai HK.
He was right about saying Shadowmoon was in development, though it's not that big of a surprise considering how popular Shadowmoon is.
It's a mere rumor, as far as I'm concerned, but it might happen with the W Returns movie coming up.
A full list of the rumor:
[HIDE]Upcoming Tamashii exclusive SHFiguarts:
-Accel Booster
-Accel Yellow Signal ver.
-Nasca Dopant T2 ver.
-Riotrooper
-Faiz Decade
-Kuuga Decade
-Agito Decade
-Kabuto Decade
-Eternal Full Maximum Drive
Upcoming general-release SHFiguarts:
-Kaixa
-Hyper Gatack
-Kabuto Masked Form
-Gaoh (new mold ver)
-Ixa (Megumi/Yuri ver)
-Saga
To be confirmed:
-Futo-kun
-Accel Maximum Drive ver.
-Accel Flight Turbuler mode
-Den-O Sword Form
-IXA Otoya (with Otoya's human head)
-Decade Violent Complete (the evil Complete form in the trailer, Decade Complete cards instead of other Rider cards on the body)
-Uva
Shadowmoon is to be released together with a new mold version of Black and Black RX.
Most will be released to commemorate Kamen Rider 40th Anniversary
[/HIDE]
Sounds too good to be true, doesn't it?