I'm not sure this is a bug, but it's a change in the way things used to work for arenas. On my shadow, was in an arena and used "Force Cloak" (1 charge available, 1.5 minute cooldown) towards the end of round one. Pre 6.0, all those cooldowns would reset between rounds. Now they don't. After round one finished, I still had roughly 45 seconds to go on the cooldown, and then when we respawned for round 2 I still had about 45 seconds to go. It did not reset and make it available immediately.