I have no idea on the actual result. I don't think I could place a bet if I was offered 50:50 odds on each choice. That said, the breakdown by region is going to be very interesting, and I wonder if the rain/floods will hit turnout in the SE, and whether that will make a material difference.
If "Remain" wins: The Guardian (and, less obviously, BBC) will be insufferable. Juncker et al will keep true to their promise not to give any concessions to the UK, even if the result is knife-edge. UKIP effectively dissolves in a frenzied pit of backbiting. Who knows what the UKIP voters will do at the next election?
If "Leave" wins: Immediate witch-hunt from Guardian, BBC. Cameron resigns. Panic in Europe. Stock markets burning. Sweden and maybe Denmark start feeling popular pressure to exit or form referendum. Juncker et al refuse any trade deals with the UK. Boris's hair a fixture on the international news.
I've observed my Facebook stream becoming increasingly stridently pro-Remain over the past 2 weeks. The Leavers are keeping very quiet, presumably because they're swamped by insufferable Remainers if they post anything. Remain posts seem to be relatively free of Leaver comments. So is this due to Remain having an insurmountable majority, due to me having a supermajority of Remain friends, or because the Leavers don't care what the Remainers think or do?
Going by their selection of stories and interviewees, the BBC have steadily abandoned impartiality over the past couple of weeks. The only really studiously neutral Beebite I've seen has been the indefatigueable Kuenssberg.