Looks like acetobacter to me, in early stages. Over time it will continue to grow, and will slowly convert your alcohol to vinegar. If you can, drink it fairly quickly, as it will get weirder tasting the longer it is kept.
I had this happen to a doppelbock I was going to store for a year, but I ended up pouring it out on the lawn as I didn't want to risk it getting anywhere near my kegs or other equipment.
This is a good part of the reason I don't do secondary fermentation anymore, it is safer IMHO to leave it in the one fermenter for the whole time, then rack off to keg or bottle.
Crundle