TL;DR: My main concern about Melee Paladins is this: I like 4.3 Prot. MoP Prot looks like it will play more like 4.0.3 Ret (which I can't stand). MoP Ret looks like it is going to remove or severely diminish the small handful of things that makes 4.3 Ret tolerable.
You need to do better research. Judgement will have a 6 sec cooldown and Exorcism and Hammer of Wrath will also generate holy power. Haste lowers the cooldowns and GCD's of a number of Ret's attacks, and Exorcism has a 20 sec cooldown (it can be used without a proc) which gets reset by Art of War. Art of War will proc more frequently than before because of the new specialization Crusader's Zeal.
Ret's rotation will be a lot more fluid. As for Prot, Avenger's Shield and Consecration will be a much greater part of the rotation, and all tanks will focus more on an active mitigation model than simply DPS.
I agree with this. Holy wrath needs to stay in all specs as it is. Rework a holy spell to give them what you want. As for the stun, holy wrath has never been an all-out AoE stun since it only worked on certain classes. Still it was a very useful AoE threat move for prot.
No it doesn't. Ret Paladins despise Holy Wrath.