Hydras may actually prove to be useful now, maybe that was their intention.
With the amount of creep spread zerg will get retardedly early hydras will be legit usefull against protoss's taking a third (not that zerg needed more help being aggressive against a toss trying to take 3 base).
I think that the overlord change is good for sc2 in general in all match-ups, and the observer change simply does a similar thing for protoss as the overlord does for zerg.
The queen change tho has such a ridiculous amount of implications its actually hard to process them all, i'd be very surprised it that made it through the patch.
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