1.) Is it comfirmed that 4p T13 still doesn't work?
2.) Haste might be only the highest stat because of the wrong setup in the simulations. The sims were assuming we still had 17% spell hit (only from hit rating on gear) which resultet in a lot more auto hits not missing and thus more value for haste. But on live, we actually don't pick that much hit so haste gets devalued.
On my slightly changed sims i had mastery as the highest stat.