The International Electrotechnical Commission has forced Apple to stop selling the Mac Pro in European countries. Apple has officially announced the news to its retail partners, and all sales for the Mac Pro will come to a halt after February 18th. The U.S. remains unaffected.
The reason for the sales ban has to do with updated European regulatory requirements relating to fan guards and electrical port protection. Apple has previously confirmed that a new Mac Pro is coming later in 2013, and the updated product should pass inspection just fine.