Hmm, looks like the EU store prices might be going up even more.
Links:
Link
Link 2
Essentially, how it works right now is that companies only have to pay VAT from the country they operate from. For Valve, they are located in Luxembourg, which has a 3% VAT. However, the change, starting Jan 1, will be that companies must now pay VAT based upon the location of the consumer. Considering some countries have VAT at 25% or higher, I imagine Valve will likely raise prices to compensate. This is of course speculation but I can't imagine that they wouldn't.