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The game is Panzar: Forged by Chaos. It's an action combat 10v10 (maybe up to 16v16 in the future) pvp game based on CryEngine 3 and it has some character progression as you can level up to 30 and spend talent points and upgrade your gear. It's developed by a Russian company but they've recently started open beta for EU (I'm playing from the USA on the EU client).
I've been watching this game for 2-3 years and since it's now playable by english-speaking players, I wanted to share it with everyone. It's not for everyone, but I think it's pretty fun and worth a try.