Android M not coming to Tab S

How it possible that Android M it's only coming to this devices

-Samsung Galaxy Note 5
- Samsung Galaxy S6 Edge+
- Samsung Galaxy S6
- Samsung Galaxy S6 Duos
- Samsung Galaxy S6 Edge
- Samsung Galaxy Note 4
- Samsung Galaxy Note 4 Duos
- Samsung Galaxy Note Edge
- Samsung Galaxy ALPHA
- Samsung Galaxy Tab A

And our tablet that was announced on June 2014 isn't gonna get the M

Like WTF Samsung 1 year tablet and no more updates