My guess is thin liquidity due to the holiday season - whether or not this turns out to be a genuine reversal, we'll have to wait and see.
I was thinking the same thing Or maybe someone got a whiff of some econ reports ahead of everyone else...
I'm just looking @ a 5min chart waiting to see how this spike plays out - if it has the legs to go higher then it may be a good time to get out of euro shorts cuz the euro has been trending higher the past few days, this could be a result of thin liquidity as well.