Peggle 2 is getting multiplayer via free DLC. A recently published Facebook post by Popcap’s Jared Neuss outlines their post-release plans for Peggle 2, which include a free piece of DLC adding the multi-player Duel mode from the first Peggle, along with regular updates to “expand and add to” the game’s world.
https://kotaku.com/peggle-2-might-be-the-reason-your-grandma-would-want-an-1443154926