Earlier this year, there were rumours of ICO and Shadow of the Colossus coming to the PS3 with an announcement coming during E3 2010. While that didn't happen, it seems Sony might be readying up an announcement, as Walmart has just put up a listing for the game on their website.
ICO and Shadow of the Colossus, both developed by Team ICO, have been met with rave reviews and decent sales, especially for their second title. With their latest work, The Last Guardian, currently in development, releasing a retouched HD version of both of their two other titles would help drum up support for their latest venture.
Sony has yet to comment on the leak. With TGS 2010 starting next week, it could be very likely that Sony will be announcing the HD port, as well as revealing more information about The Last Guardian.