Czech pirate station Radio Bila Hora says that they will be on 2458.3 from 1600 (UTC or Czech local time UTC+1?) on December 31.
They were reported on the frequency December 17 2000 to past 2142 by Nick Rank and Alan Pennington, BDXC-UK Yahoo group and on the UK based shortwave free radio blog http://shortwavedx.blogspot.com/
Long article about the station and its broadcasts translates quite well into English:
http://rbh.czechian.net/
Info via dxld