There's also a newly updated Space Mountain at Tokyo Disneyland. The Tokyo version took the bulk of the Disneyland 2005 updates look and feel, but also changed it around a bit. Tokyo's new Space Mountain opened in April, 2007. It has a very similar look to the queue, station and most interior effects to Anaheim.
But, Tokyo Disneyland's new Space Mountain did not include the new onboard audio that Anaheim received. Tokyo's version still has no onboard audio, with audio limited to the lift hills, some general stuff in the dome, and the "hyperspeed tunnel" that is similar to Anaheim.
This is important because everything I've heard about the WDW remake says that onboard audio will not be added to this attraction in WDW. Correct me please if anyone has heard otherwise. I think WDW might see a look and vibe and plotline that is similar to Tokyo's new Space Mountain, since that remake can't rely on onboard audio to help carry the attraction story and further the show.
Disneyland's Space Mountain opened in 1977, and had a big rehab in 1996 when the onboard audio was added, one of the first uses of such technology stateside. The 2005 Disneyland rehab replaced the rocket fleet, and also replaced the onboard audio track with newly composed music. The new rockets feature four speakers per seat with a subwoofer in the middle of each row, and the effect is FANTASTIC! Much better than the earlier systems used on Rock N' Roller Coaster or California Screamin'.