Not exactly new,, but I thought I'd add this here, since Japan's finally getting this.
According to TakaraTomy's Transformers Twitter account,
Transformers Prime is scheduled to start airing in Japan in April 2012. No channel as of yet has been announced, though TV Tokyo/TV Aichi have aired the series since Transformers Beast Wars back in the 90s.
Still wondering if Japan's going to get Thundercats...