The loss of any HD channels on Freeview is disappointing, even if they are of the +1/repeat nature.
Aren't the channels that are listed as ceasing (Ch4+1 HD, 4seven HD etc) on COM7 so it's that one that's closing, rather than COM8 ?
I think BBC News HD is also currently broadcast on COM7 so as it's not in the cease list, it looks like it might be moving muxes.
Also - as BBC Four HD and Quest HD are not in the list of channel that are ceasing, that implies to me that COM8 is simply moving, hence the re-tune advice. Fingers crossed !