Yes, I expect now that we have Regina, Rumple, and Hook united in a common alliance we may see our former villains unleash some pretty strong measures against the enemy. We will probably see them do plenty of things the Charmings might not be able to bring themselves to do.
And, further, the Charmings might ok with some of the things Hook, Rumple and Regina do because they want Henry back. I think a lot of S3 is going to be watching some of the heroes tread that fine line between good and evil.
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"He was a lot of things to me" "The only conclusion was love"