Just a copy paste of what I have on the EJ windwalker thread right now, trying to spread the info a bit:
I've just finished some testing of PTR mechanics. Ascension is the *clear* winner for both 2h and dw at all gear levels and only gets better as gear increases. Its pretty easy to see how "simplified" the rotation has become with: no longer needing to track power strikes/finding time to use chi brew on cd; a 1 chi increased cap; only needing 1 tiger palm to get full 30% arp.
That being said, using ascension is about a 3k gain over chi brew/power strikes. The tiger power change resulted in a roughly 2k dps gain over live. The most interesting thing I found about the TP change and ascension change together, FoF usage becomes even more negligible than its current state. I ran a gambit of stat weight combinations, with and without using fof, and picked out the best stat combination for all 4 cases. All testing was done at 50k iterations. This is considering the FoF tick loss bug, so if that gets corrected anytime soon, FoF will more than likely be a non-negligble increase again.
DW, capped haste at just below first breakpoint, full crit stack passed that, USING FOF: 121085.7
DW, crit = haste, NOT USING FOF: 120174.3
2H, capped haste at just below first breakpoint, full crit stack passed that, USING FOF: 115414.4
2H, crit >> haste >> mastery, NOT USING FOF: 114543.0
So, TL;DR: FoF use results in a roughly 0.76% dps increase for both. I consider this negligible at best.
The new stat ranking for 2H is crit > haste > mastery
The new stat ranking for DW is crit = haste > mastery
There was no discernible point for either at which those rankings changed, at least that was achievable.
-edit- Forgot to mention, you shouldn't go full panic mode about tiger power anymore. If you'll cap energy within 2 seconds, nice number for gcd + human error, you shouldn't refresh the buff