Most schools will continue the timetable online. Students will be required to log on, just as they would be required to turn up to lessons in time. At one school one of mine is at, there will even be online assemblies at 8.40, twice a week 
Coursework etc will be due as normal. Mine are in 3 different schools and they’ve all sent emails about this.,
I expect universities will have to reject some who they have made conditional offers too, depending on how much various courses have over-offered by?
Maybe if the required grades for a course were AAA, they may have to offer first to those whose predicted grades were AAA* and then work backwards until places are filled?
But they will have to adjust for contextual offers as well.
I don’t know, but I can’t see what else they would have to go on?
Oxbridge can obviously factor in interview performance and their own pre-interview assessments of course.
One of mine was due to have exams after Easter to determine predicted grades - probably these will also be teacher assessed now?