Just read the preview for this game on the Wii. It boasts a 32 player online experience. All I know is it's fun to frag with the wiimote or zapper. This will be a definate buy for me. Matt Casamassina hints that this might outdo Metroid Corruptions controls. It sounds like you can tweak it more.
http://wii.ign.com/articles/817/817116p1.html