Season 2 of BIMA Satria Garuda is officially titled Satria Garuda BIMA-X, according to the press release earlier today.
The new series has been planned for 50 episodes, and will start airing on September 14, 2014. And there will be a one-hour special (‘Satria Garuda BIMA-X: New Beginning’) which will be aired a week before the first episode (that is, September 7).
Bima will acquire new power stones and can change modes/forms according to the stones he’s using.
There will be also several new casts (pro- and antagonists). One of them is Thalia from JKT48, following Stella Cornelia (now ex-JKT48), who’s returning for the new series.
The new enemies are either monsters from Parallel World disguised as humans, or humans who become monster because of corrupted power stones (still a wild guess; there’s no public articles from the press release yet, will update). And the boss’ name has been changed to Black Lord, from the previous Black Priest.
There’s a published article which will tell you details about the press conference, here.