BIG changes this year for Hearthstone:
Some classic cards will be pushed into wild. They will be replaced with new cards? You will get your dust value for these cards without having to dust them.
There will be 3 full expansions this year. Instead of adventures, they'll just include some free optional single-player content along with each expansion.
They will give more support for the wild format, so it's not just a ghetto.
Some extra rewards, like daily login awards, new hero, etc. for a limited time.
I like that they are rotating some cards that are in every single deck, like Azure Drake, and also some of the most annoying cards like Conceal, Sylvanas, and Power Overwhelming. I just wish they would rotate some other cards that are in every deck like Bloodmage Thalnos.
I like the free dust without having to dust your card when it goes to wild. It's much better than changing a card and letting you dust it for full value if you so choose.
I like the full expansions instead of the adventures, because more cards. I don't like it, though, because I really liked the adventures. They are crazy fun. I don't know if the new single player content will be as good as the old adventures.
Also, this is an obvious money grab since packs make them way more money than adventures. I've saved up enough gold for an adventure, but not enough for a full expansion. Having 3 per year will definitely force people to go to the wallet and not just the gold pile.
Three expansions a year will also be good because the meta-game will change much more frequently to keep things fresh.
Nothing said about arena, which I would like to see get some love.