We've discovered a pricing issue whereby the conversion from Euros to US$ was not performed correctly. This only affects players with Steam Wallets in US$. The net effect is that the US$ prices were about 15% lower than what they should be. Just treat that as a launch discount ;)

The servers will momentarily reboot to apply the fix. The process should not take more than 10 seconds, but note that you will be disconnected during this time.