I don't know why you guys are freaking out about things being over tuned. Getting the tuning right is the reason that these tests are being done. That means if things are too hard, they will be tuned easier for the next time. Release is still a week and a half away.
I thought eagle, bear, lynx and zul'jin all looked amazing. Those tornadoes on Zul'jin were moving at the correct speed. They ran faster than players on retail also, and shaman/pallys always struggled on that phase. The best way to deal with them was to put your back against a wall and heal through the damage. As a tester you shouldn't be complaining about mechanics that are working correctly.
Dragonhawk looks to be slightly over tuned, but the group was also mishandling the mechanics. The intended strat is not to release every dragonhawk on each side at one time. You should have at least 3-4 hatches or else you're going too fast. Also, healers kept getting killed by bombs, and the raid was positioned to get half the raid hit by every flame breath.
I saw some Hex lord, but you guys were 2 healing and weren't even running a priest. I remember Hex lord being a nightmare without a priest for shadow resist, and it was also hard to 2 heal.
You had serious comp/strat issues with both of those bosses (dragonhawk and hex lord). But it really didn't look that hard, all things considered. The only thing that makes me hesitate was that you should probably be able plow through them anyway with t6 gear.