How do I feel? To be honest, rather "meh".
I do like the idea of an MMO with non-boring gameplay. But then they had to go and make it FPS gameplay. Yeesh. I have nothing inherently against FPSs, but I've played a lot of them. These days they have to do something pretty bloody special to get so much as a second of my attention.
Also, the visual design looks boring. Within 24 hours I will have forgotten every single thing I saw in that trailer beyond the fact that there were some men firing guns.
If they offer a free trial or some such then I may give it a brief look. If they're going to ask for a subscription then I won't even bother.