512MB memory card?

Gamestop.com has posted a 512MB memory card on their site for pre order. This does make sense because the current memory card is 64MB and Microsoft told XBLA developers that the games had to be no larger than 50MB so the games could fit on a card for people who dont have a hard drive. Well now that microsoft has raised the limit on all XBLA titles to be no larger than 250MB it makes sence that this new memory card all of a suddon shows up, although it is a little strange that Microsoft never officially announced the new larger card but maybe they didn't think it was realy that big of a deal.