Heh...
I didn't know about Leonardo Dicaprio and Akira.
I do know that there's a Cowboy Bebop movie in the works with Keanu Reeves as Spike Spiegel. Also, there's been talk for several years about doing a live-action remake of Evangelion.
I'm not too sure about Ghost in the Shell. It certainly has potential with Spielberg at the helm, but it's probably going to be very different from the Ghost in the Shell that we all know and love. I'm not too sure if that will be a good or a bad thing, but I'm certainly interested.
The manga, movies, and series are all very different from each other. I would kinda hope that any live-action version would be closely related to Standalone Complex.