Don't pin much hope on DF. They've been making it since like 2000 and arent even near a beta from everything i've seen. Seems the only people who can even comment if it is real or not are those who work for them.
Dark and Light has promise. I don't like the factioning system though. Telling me who I can and can't attack, like WoW, is for yuppies who want to pretend like it's aPvP game. But, with the size of the world (I can literally stand ontop of a mountain 10,000 feet above sea level and see a town that would be like being ontop of Invorri and seeing Khar) and with hand-gliding and such, it will add a very realistic and unique spin on the PvP. The world is the Death server, x500 in size.
Lots of us are actually in the beta for it, so, i'm pinning more hope on it than Darkfall.