The UK, France, Italy, Germany, Spain, and the Netherlands are all involved in the investigation, and it's up to regulators in each of those countries to investigate the situation and decide what to do. The worst case scenario is that every country decides to take action and fine Google a good amount of cash, which will add up when you take into account that there are six countries issuing fines.
It's not said how big of fines Google could face, since regulators from each of the countries still have yet to make their decisions on what to do. Of course, though, this isn't the only time that Google has had run-ins with Europe -- the company seems to be making so enemies over there with various governments.
[via The Register]