As Andrew says, NHK World is due to launch this month, though no date has been confirmed yet, but has been testing off EPG for a while now.
If it's rumours you want, Chello Media who own/broadcast the CBS channels on Freesat applied for HD broadcast licenses for CBS Drama HD and CBS Action HD back in december, so it's possible they could be heading to Freesat in the future.
http://www.ofcom.org.uk/static/tvlicensing/cs/1124.htm
http://www.ofcom.org.uk/static/tvlicensing/cs/987.htm