US equity futures on the S&P 500 (/ES) went from +15 to now -8 and at one point 5 minutes ago was -15. Down would mean the voting is for Leave!
Volume on the /ES is put as it has fallen too.
Not sure if/any credence in the bitcoin land is hitched to BREXIT, but there was a $100 swing in 1BTC today. Currently on the climb. Pump and Dump or traders getting their money out of EU and?