Hold me.
Edit: From what I can make out, they come with 3 special Sega windows themes, 60 tracks of music from Sega's big titles. Top plates can be purchased seperately, so you can get all 4 with one laptop. Top plates are 8,925 yen each.
Edit2: Some little pictures of the Sega one.
Thanks for those pics and info Dwayne, I added your post in the OP!