A picture of a Best Buy placeholder box obtained by Kotaku clearly states that copies of Sucker Punch's superpowered open world game inFamous (PS3), due May 26, will include a multiplayer beta voucher for Naughty Dog's fall-due Uncharted 2 (PS3).

The voucher is listed as valid from 6/3 through 6/28/09, likely dates for the beta.

While Sony has yet to officially confirm the existence of multiplayer in Uncharted 2, rumors of its inclusion popped up earlier this week on ScrewAttack.

The site specified that Uncharted 2 would pack cooperative multiplayer, a separate mode from the single-player campaign, along with a competitive multiplayer mode, adding that more details would be officially announced on, you guessed it, Monday.