Well, I have seen the trailers for Speed Racer and as far as I can tell they took the show and tried to make it serious. I was expecting a cheese-fast, something I could laugh about, but for the most part the trailer was just boring. Lots of bright colors and flashing lights of the amusement park=like race track, but none of the cheesy acting or anything was carried over. I can understand why they didn't, but still, that was my favorite part of the show....but I never really liked Speed Racer to begin with.
As for Akira...if they are adapting that, I may scream out of joy and out of dread. There is so much in the manga that was cut to make the anime, and I can only imagine there will be significant cuts again to make the live-action (Then again, if they are splitting it into two, maybe they will be adapting the manga more than the anime). Either way, I will be waiting for it big time. (Just can't wait to see Tetsuo explode that group of people in the hospital hallway....^_^)