I don't know which type of motor the Domino uses. Some will run just fine on 220 others will run 2x as fast and burnout quickly, and others will do a HCFIª.
Phone Festool's customer service and ask for David- he is very well versed in all matters electrical and will be able to give you some definitive answers.
You may need a step-up transformer, although frequency is not a problem.
I found out a 2000 Step down transformer works fine for the Domino.
I'm looking at purchasing from USA because a Domino at todays exchange rate is about US$800'in the US and here in Australia costs about US$1500
You realize that the difference is due to import duty and by the time you get hit with that the Domino likely will be even more expensive than if you bought in Oz. Check to see if and what the duty will be.
BTW a good dust collector like a CT is mandatory with the Domino.