The Japanese video X-Men: The History includes footage of a version of the game prior to v1.00 (941208).The character select screenshot is from Fighting Vipers. Screenshot on the left has an early HUD.Flyer screenshots do not have the Sonic air freshener on them.The home computer versions were like the pre-release as well. Flyer shows the HUD in a different position in most screenshots of the game, having it on top-center like Space Harrier rather than the left like the final.Flyer shows a different character sprite to both the final and the early unused one in the ROM.Flyer shows script changes during intro cutscene (albeit partly blocked off by advertising text).Early screenshots can be found of the game, one of them with a title screen just calling the game " Daytona" (find the source/magazines with this info).The Sega Video Magazine tapes (which lasted from 1993-98) have a bunch of prerelease footage from various games.With the release of Rare Replay, Rare has been divulging plenty of information about early builds of its various games.Not sure if the same applies to shown version of War on Wheels. EGM Issue 13 (August 1990) has previews of some games that ultimately ended up being unreleased, including a version of Block Out that varies from the one dumped.1, 2 - Geisen online magazine (check the linked pages).Gaming Intelligence Agency - news and images.