Polls suggest it's still pretty much a partisan effort...with some predictions looking much like the 2010 election.
I don't doubt that many of the signatures on the recall petitions are Republican. Public Safety personnel represent a dichotomy of sorts. On the one hand, they tend to lean very conservative in a majority of their evaluation of various issues...and register heavily as Republicans. Yet, their livelihoods and careers benefit greatly from union protection. I think Wisconsin leans right enough to counter this push, but the reforming of essentially all public sector jobs means you are going to potentially impact large numbers of Republicans who just might not be comfortable with it.