The release notes file that comes with the game has mistakenly listed a few development changes, which are usually kept from the public. The new release however lacks splitscreen support as well as some code that allowed modders to add it themselves.
Resident Evil 5: Gold Edition ditched Games for Windows Live for Steamworks recently. In the transition from GFWL to Steam, Resident Evil 5: Gold Edition lost some code that allowed modders to enable splitscreen support.
