Hmmmmmm.....
I'm not sure about "massive faction interest" at the moment. A few people / guilds are saying that they'll join after the publish goes live, but there doesn't seem to be a great deal of commitment at the moment.
One of the major PvP forums has an extensive thread which contains quite a bit of speculation which I know to be incorrect.
I will still be one of those who xfers to Atlantic to die gloriously for the honour of Europa if the big event ever comes-off, but at the moment I don't see a reason to sign-up again on Europa: The mindset of many of our current PvPers doesn't seem compatible with Faction play. In a world where gate-hugging, house fighting, and stealth archer/tamer ganking is the norm, I doubt that the large-scale base raids and defences of the past are going to be popular; after all, what's the "reward" for doing that sort of stuff?
Prove me wrong, and I'll sign-up in a flash. (Sorry if that last sentence looks a bit aggressive - that's not my intention - I'd like to see it happen, but it will take more than a few small guilds signing, and a few others saying "maybe later" to enthuse me.)
@Nico....
If "HE" had a vendor, what would he sell... bloodwood and nails?