"This news coming from Cesky Rozhlas is a complete surprise. Dr Hansjörg Biener quotes the official website in his article written today on Ydun's MediumWave Info.
On 04 January 2016 the following stations will close:
270kHz Uherské Hrad (iště - Topolná
639kHz Praha - Liblice
954kHz Brno - Dobrochov
954kHz České Budějovice - Hosova Kolonie
954kHz Karlovy Vary - Stará Role
1332kHz Moravské Budějovice - Domamil
The only surviving station will be Ostrava Svinov on 639kHz which will only broadcast from 05 January 2016 between 1500-2300UTC." (MediumWave Info via Bengt Ericson, ARC)
Update from Ydun M. Ritz:
I think there is a misunderstanding here! As far as I can see, it is just CroPlus, who leaves MW except for 639 kHz. CRo2 will still use the above MW frequencies.