I don't know whether this is significant, but the Southern website is now showing two additional departures from Brighton to Falmer on Saturday 16 July - the extra trains leave Brighton at 1302 and 1402 and run non-stop to Falmer. Other departure times are at the usual 10, 22, 40 and 52 minutes past the hour, calling at London Road and Moulsecoomb.
As of now, the timetable for Saturday 6 August is still shown as the standard 4 trains an hour timetable - but this may, of course, be in the process of being updated.
So there are 8 trains between 13:02 and 14:22... That's looks like good news... anything extra scheduled for the return journey??