Old engine, new look for the game. Just some screen shots here, but they looks pretty good. However, they looks exactly like Titanfall to me.
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I always wondered how would valve handle it if the fans just decided to make Half-Life 3 themselves. Using unreal engine 4, a wholly made fan story and then release it on PC. With the way Valve has treated fans I would be surprised if a cease and desist would be sent.