Team Deathmatch will be available throughout the beta; while 3-Team Deathmatch will run during the first (June 18-July 4) and third (July 9-13) sessions; Plunder and Co-op Arena will only run on the first session; Free-for-All, Team Objective and Co-Op Hunter will only be available on the second (July 4-8) session; and Co-Op Adventure will only be available on the third session. As for maps, Airstrip and Chateau will be playable during the first two sessions, with Yemen replacing Chateau in session 3.
I know I'm excited for this beta. How about you?
For more information on the Uncharted series, please visit the Uncharted Wiki.