Ben Brode talked about the leveling reward experience in one of his AMA videos for WIRED, a few months before he left. Him leaving means you need to take his words with a grain of salt, but The Brode noted that the team was aware of peoples' desire for additional rewards to be earned beyond leveling to 60/hitting 500 Ranked wins. Thought was given as-to how they would expand on them, but they were not yet ready to talk about it in greater detail.
Translation: "We know you want it, we just don't know if (or when) it will happen"; i.e: "it's not a priority."
Well, I'd love some, but there is nothing, and unlikely to happen. The vast, vast majority of the player base will never do this, so they don't really implement many features that the vast majority will never see.
Don't any any attention to all the people saying the golden heroes are the reward. And nothing else is needed.
I think a huge problem with Hearthstone is that eventually you just run out of stuff to do. Once you have your golden heroes and your legend card back, all that is really left to do is hit Rank 5 every month (or whatever rank floor you aim for.) It has always felt super unsatisfying to hit a certain number of wins and get nothing. I just hit 5000 wins, and I got nothing, no nod of approval from Blizzard, no thanks for playing our game, nothing. At some point, it's like why am I doing this. I have fun playing, but it's always more fun to be playing towards something. All golden heroes are the same thing. Once you do it, then what?
I'm not asking for money or 1000 gold. I am not one of those greedy players that cries about hearthstone being a money grab either. Would just be cool if they had a glowing gold hero or platinum heroes. Just something that highlights a pretty difficult achievement. Nothing monetary.
I have reached legend both in wild and on standard, have hit 12 wins in arena, and soon will have all golden heroes. I will still play the game as long as I find it enjoyable, but would love to have something more to play for.
it's weird how wanting 1000 ranked wins to = a platinum hero or something simple and cosmetic apparently makes me entitled.