WoW Insider got a chance to play with the addon from its early beta on, and it's extremely impressive -- not only will you find the usual addictive peg-hitting gameplay that we've come to know from Peggle, but PopCap and creator Michael Fromwiller (whom we interviewed about Bejeweled, and who we're told is actually being hired on full-time at PopCap as soon as he finishes school this spring) have really added a new level to the game by tying it right into World of Warcraft. The game rewards you with "Talent points" that can change the gameplay itself, and you can challenge other players within World of Warcraft to duels and score battles. There's even a "Peggle loot" setting, which, when used as Master Looter, will let your guildies and friends with the addon actually take Peggle shots against each other to determine who gets loot drops.
It's really wild. Read on for our early impressions of the addon, check out the gallery below for exactly what it looks like, and then go head on over to PopCap's site to download it for free yourself.
Gallery: Peggle for WoW First Look