If uncharted 3 can really nail the multiplayer and gain a significant fanbase for the mp, then sales could really skyrocket and maybe propel uncharted into gears levels of sales 6-7 million ww instead of the 4-5 million region. Gears 3 is probably looking at doing more than that though but i think it will be a great accomplishment of uncharted to move into the "mega franchise" sales levels.