Hah! Fell for it too.
Seriously though, I seem to recall Steve Jones doing an April Fool's joke about SQL Server on Linux a while back. And yet, to many people's great amazement, Microsoft came up with the goods about a year later. Maybe they were just tickled by Steve's sense of humour and thought: Hey, let's just do it!
Whatever the exact reason, I hope it happens again. Maybe Steve is on a lucky streak.