After 4 runs in kraken i´ve notices a few differences with BID4 on Retail DBO (TW):
1) Kraken is not buffing himself with invincible if you kill him too fast.
2) Super summoning frequency is too fast, and it summons 4 mobs each time. In TW he only summoned 2 each time.
3) Poison debuff is not draining ep.
4) Legendary Drop rate is still too high.