My wife and i got 5.0.2. a month ago in Denmark. The Alpha should be on the list to get 6.0, so i think Samsung will skip 5.1.1. And that's ok, as long as they give us 6.0 next year. You can check at Sammobile.com which firmware there is available for your phone in your country. By the way, 5.0.2 is not that great, there are several app's i can't use because off new Google permissions. And sometimes when i run Chrome or Maps, the phone gets very hot, i actually thinking about downgrading to kitkat 4.4.4.
Hm.. I have no heat issues when using any app. And I really hope we get 6M as they boast a lot about the battery life improvements. I get a whole day out of mine but I'm wellcoming some margin.