The short answer is yes, and it becomes more likely given the way he's been treating the Republican Party since his loss.
There is the never-gone-away question of his 2009 tax returns. The IRS could certainly take a look at them, as people have said all along. In 2009, there was amnesty granted for people with certain type of Swiss Bank Accounts: confess, pay a fine and don't face prosecution. We know he's got some left, so, it's a maybe.
Then there's the issue of prosecution for where he lived when he ran for governor of Massachusetts, and the possibility of election fraud. It all hinges on when he left Bain. This prosecution is unlikely. However, MoveOn did file with the DOJ related to Mitt's misstatements under the False Statements Act relative to his Bain tenure. Full data here. That would be jail time.
There is the potential legal action related to his testimony in the Stemberg divorce case, where he undervalued Staples stock. This is less a potential prosecution than a civil case. The investors can sue, but it would have to get really dicey for the SEC to intervene.
But then there's this:
Exactly ten days ago, this column reported on a Delaware bankruptcy court’s failure to enter an Emergency Motion into the public docket that included Bain Capital and Romney operative’s perjury and corruption in the eToys bankruptcy case. At the time it appeared the judge was protecting Romney and Bain Capital by suppressing the Motion in expectation he would win the election and have the Motion tossed out of court leading to the question; “is Romney’s main impetus for seeking the White House to appoint an Attorney General who will guarantee that all charges against him will go away?” Well now that he lost the election, it appears the allegation had merit because on November 7, the day after his crushing defeat, the Delaware bankruptcy court judge entered the motion into the public docket and scheduled a hearing for December 4, 2012; all on the same day. Source.
This is where the Republicans come in. The Republican Governors Association met this week in Vegas, and nothing stayed there. It was a postmortem on how they lost. One pollster told the truth in saying that the problem was "too many Democrats", which is, of course the most simplistic answer: more Democratic votes would overshadow fewer Republican votes. But many prominent Republicans distanced themselves from Mitt and his 1%-related focus. The best thing that could happen to the GOP would be if Mitt was indicted for something. It enables them to reset the party, prove to the evangelicals and low-income Republicans that Mitt was an aberration, and that they're actually inclusive. They would say NOT that he was next in line so they did all sorts of things in the primary to make him the candidate, nor that he was the best of a weak field. They WOULD say that he tricked "all of us" and while we tried to help him, he was what the Obama campaign made him out to be, and we're lucky that he's going to pay for his sins now.
Think about it. There can be collateral damage to Bain itself, but none to the party.