Due to changes made to regulatory standards, Apple will be discontinuing the Mac Pro in Europe starting March 1. MacRumors received a copy of a note sent out to European distributors regarding the discontinuation of Apple's tower computers, saying that the Mac Pros "are not compliant with Amendment 1 of regulation IEC 60950-1, Second Edition which becomes effective on this date."
While the Mac Pro has been slowly dying off the past couple of years, due to lack of demand and what seems like no interest from Apple to give the series a big update, the discontinuation of the Mac Pro in Europe actually has nothing to do with this lack of demand from users. This only affects Europe and a few other surrounding nations, so Mac Pro sales will continue in all other countries as usual.
The new product certification standards in Europe appear to have something to do with a few internal components in the Mac Pro systems, such as power supply parts and various wiring. It's currently unclear exactly which aspects of the Mac Pro line don't meet regulatory standards, but any new Mac Pro systems will not be shipping over to Europe after March 1.
Resellers in Europe will be able to continue selling existing Mac Pro systems that have already shipped over, even if the March 1 date has passed, but starting at that point, no new shipments will be going to Europe. Apple has announced that a redesigned Mac Pro will come sometime this year after the company barely updated the line in June 2012 with outdated processors and no big improvements.