This was posted 10 minutes ago and you commented 5 minutes ago. Given I tried to download it and it failed with some weird error message on their site (not to mention registration walls suck) the logical conclusion is that you are not serious about your comment. That then begs the question why you would post such a comment. Looking at your submission history, one could easily assume you work for Microsoft.
If that is the case, I would suggest you guys grow a brain and remove the registration wall. It's 2015.
Their comment wasn't based on using it but simply based on "Visual Studio on something other than Windows" more than likely.
Registration walls are only a bad idea when you care that a product reaches as far as possible. Given "Visual Studio on OSX/Linux" is going to drive humongous amounts of interest the extra metadata they get from the registration wall is worth annoying a few people.
On a side note several people have said that it is likely not available yet.
My first thought at seeing this announcement was also that I would be uninstalling Sublime on my Mac. I'm not a Microsoft employee. And give MS time, they just announced it, available "later today". No need to assume a lack of brains.
If that is the case, I would suggest you guys grow a brain and remove the registration wall. It's 2015.