I'm thinking that the expansion set might have multiplayer.

Veteran Sellswords is the first card that gets exchanged between players. Also uses the phrase target opponent gains control.

Other cards have said each opponent also. It was a dwarf card if I remember correctly. I think FFG should post the Multiplayer rules for free honestly. The packs will sell so they don't need to hype the expansion box with multiplayer rules. Just having the elves alone will get enough sales.

I think Eric needs to get them playtested more with furture packs so he is holding back on releasing the final rules. I do believe FFG will post an article with the multiplayer PDF rules so no worries. I can wait.