Please sign a petition to FFG: make an expansion to Relic!
Two things - These forum petitions never work, FFG will either do or not do an expansion, regardless of any petition people may come up with. Having said that, it's almost a guarantee that FFG will make expansions. it's just a matter of when. You'll just have to be patient.
Agreed with BatHead, my signature for the petition is buying the game! They'll make one if they think it's profit to be had.