This is all subject to change of course, but only Afghanistan is my guess, because that's the status quo and I sincerely doubt that Romney is going to want to deviate too far from it in the end. I imagine the prospect of reelection will altogether trump any major risk-taking. I also think that assuming President Romney would hold the same views as the Romney of the primaries is hilarious, given who we're talking about here.
Romney will be pushing 70 in January 2017, so maybe he will be satisfied with one term. He will have a tough job ahead of him and the economic crisis will probably still be a factor and make it hard to get reelected.
I think Romney will be more committed to finishing the job in Afghanistan than Obama and slightly more likely to assist Israel in an airstrike against Iran. Otherwise I see no major differences. No other wars unless there is an attack on the US or an ally like South Korea.
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