Let's say this:
The Daily Prophet knows pretty much as much as the Ministry and the general student public know, although the students may know a bit more. The Prophet would publish that students had died unexpectedly this term and that Voldemortist was suspected as being behind it. It would also publish that rumors had gone about that Voldemortist himself had been seen on the grounds and had entered the school for some unknown reason. Perhaps something about the ghostly staff all being returned to their living forms (except Spots), although the students and outside world would have no idea how that had happened.

Basically, a bit of the Rita Skeeter line of journalism... a lot of speculation and a few facts sprinkled in. I think parents would be very uneasy about sending their kids back next term.