The cusp of Diablo 3 seasons is they change in game mechanics and how you can build your characters. So far this is the game plays the same but you get even more cosmetics!
I'm not against more cosmetics, I think they're good to have. Only they should be the bonus that you don't even talk about prior to release so players can be surprised by how rad the new item I get looks. I'm not going to be excited about being told I'm going to get a new transmute effect months from release, if I don't know about one when it drops it will be a cool experience. What you should be talking about now is how you're going to make the game better.
That's too bad. When I saw seasons I had hoped Bungie took inspiration from Diablo 3.