Mists of Pandaria x100 realm's transition to 5.4.8 is going to take place on the 4th of January at 4.00 AM Moscow time.
You can download full 5.4.8 client right here: http://torrentu.biz/details.php?id=19
Also, you can download update patch from 5.4.X to 5.4.8 by following this link: http://torrentu.biz/details.php?id=20
Have a good game.
Sincerely, server's administration.