There is nothing on the website or booking facilities to indicate that the ability to use the Caledonian Sleeper as a day train is returning or that they will offer more than eleven seats in the seated coach overnight.
I just had a look on RTT and the Fort William portion is loaded as not taking intermediate passengers until the end of the current timetable (12 Dec). Although obviously this could be varied, it does suggest little intent to change.
Did they not respond to an inquiry a week or two ago that they would be reviewing the decision following the announcement this morning? If that's the case then we might hear more in the next few days.