With the new possible combinations with the epic destinies i think Kensai just dropped to the lower position in the DPS chain: now everyone can have Haste Boost 30%, this makes properly DPS specced rangers, paladins, monks, barbarians better DPS-Wise than Kensai is.
On the top of this add the Nerf to the Kensai Power Surge Bonus.
Add as well the need of new feats to keep up a good Kensai: no more huge amount of toughness feats ... you need to take cleave and great cleave even if you are TWF to get the increase in DPS from the epic feat. So less HP than before.
There are fewer reasons to be Kensai now. Correct me if i'm wrong.
BR,
Z.