I was looking through a couple of the threads on the main page and noticed how many people hated the redundancy and 'bandage' feel of throwdown. I came up with what I thought to be an interesting replacement for it after building off of what a couple other people were saying.
Either incapacitating or stuning the target for a longer than usual duration, (5-8 second range), but keeping you in a channeled state. During the duration, dots would not break the incapacitate and you would deal damage equal to a tick of rend each second (possibly more or less based on balance issues). You can move to break the channel at any time. The most interesting part of it would be that whatever is done to you or your opponent is done to the other as well (in the case of dd, possibly lowering the duration of the channel as well). If your oppenents try to heal their comrade, you recieve the heal as well. If they damage you, they damage him as well (same applies to your teammates). Damage done by you or your target are treated seperately from this and act normally. Perhaps split them into percentages of 50%, but with the claimed massive health boost in Cata, I don't think any kind of split would be necessary.
I was also tossing around ideas of whether or not both you and the victim should still be able to use instant (sans whirlwind and similar) abilities, while disabling auto attack. Basically give warriors an ability with the feel of a brawl and clear CC potential in pvp. Weigh in with ideas or suggestions (or applause ).