Originally, Capcom planed to release the Alternate Edition als downloadable content. Now they announced that there will be a Gold Edition next year, which contains the maingame Resident Evil 5 and all the new content. The Gold Edition will be on a Blue-ray disc for PS3. If you have an Xbox, you'll get a DVD with the maingame and a token for the new content.
The Gold Edition will be released in March 2010 and it is supposed to cost 49,99$.