Due to amendments to EU electrical safety regulations, sales of the Mac Pro in Europe are to stop on March 1st, according to Mac fan site Macworld. The standard IEC 609501 was revised in December 2011, but only comes into effect at the beginning of March, which directly affects sale of the Mac Pro. This is due to the power provided to the system I/O ports as well as the placement of the product fan guards.
The current version of the product, however, has not had a revision since 2010, so it is likely that a new Mac Pro will emerge soon afterwards. Apple CEO Tim Cook also stated that Apple is working on the successor to the popular desktop in 2012, who also stated that the product would be released sometime in 2013.