Update: Along with the 'mystery event' taking place tonight, the duo previewed a new track before Squarepusher's set at the Detroit Music Festival. It is rumoured to be called 'Cold Earth'. [via Fact]

Last week we got a first taste of Boards of Canada's new album in the form of 'Reach for the Dead', but it seems the duo have something else lined up for tonight. A new song? Full album stream? There's little point in guessing anymore, but we should find out at 17:00 PDT (about 1AM GMT time) according to the image they tweeted.

Tomorrow's Harvest is due for release June 10 in Europe and June 11 in the United States via Warp.