I commented on the latest news but I think this is worth the discussion.. I think arena has no real fun reason to play it, most of this OP will be a copy paste from that comment on the news article: but I reformatted parts of it to be more readable.
https://outof.cards/hearthstone/1792-the-arena-will-keep-separate-rewards-from-hearthstones-battle-pass
What is wrong in arena? (At least for me)
I don't like that the runs take a lot of time and you needs an insane win rate to actually profit from arena, I don't feel like sitting through 12 wins only to get trice the entry fee.. the arena feels unrewarding for the time poured into them.. I didn't play arena for over 2 years and I used to play more when I didn't had many resources it's feels like a chore..
I do enjoy the gameplay but it feels like such a big time and gold commitment to play.. I just hate playing it and losing too fast or make risky picks.
The reward system is the same since beta... SERIOUSLY.
Suggested estimated rewards that would feel better:
lower the entry fee, lower the max wins, increase the reward threshold.
Show Spoiler
entry fee:50 gold, win caps at 10 instead of 12.
0 wins you get 40 gold (so you can't reroll indefinitely)
1 win you get 70 gold worth of dust/cards/gold,
2 wins you get a pack and 20 gold worth of stuff. (the first pack is from the latest expansion)
3 wins you get a pack and 50 gold worth of stuff (3 wins is the new 7 wins, you have over 50% win rate at this point!)
4 wins you get a pack and 75 gold worth of stuff.
5 wins it's 2 packs and 20 gold worth of stuff. (the second pack can be anything even a yearly pack!)
6 wins you get 2 packs and 70 gold worth of stuff.
7 wins it's 3 packs the third is also random + a chance of a cosmetic.
8 wins you get 3 packs + a guaranteed golden rare + random reward worth 20 gold + a chance of a cosmetic.
9 wins you get 3 packs + a guaranteed golden rare + random reward worth 80 gold + chance of an epic + a chance of a cosmetic.
10 wins you get 3 packs + a guaranteed golden epic + random reward worth 100 gold + 50 gold + a chance of a cosmetic.
I just threw numbers and rewards but something that will be exciting to earn and not just.. "value" it feels bad to play arena and get some value we want to get special rewards or get guaranteed rewards on good runs.. arena feels BAD to win at and feels bad to get less than 7 wins you get less than the fee.. and need insane win rates. About the cosmetics: it's not a hero skin (maybe as a rare 10 wins drop) but it's something to grind for like some alternate card art or some old card backs.. give players a good reason to play more arena the mode is fun the entry fee is discouraging and so are the rewards.
More improvements suggestions:
1.Would also enjoyed the mixture of the expansions in arena but it wasn't conveyed correctly had no idea what to play or not around there was no way in game to tell which expansions were available.. for that a new feature needs to be implemented which is a peek into the available pool just open a collection manager which shows you the expansion available and what cards are legit or not, from the draft screen no need to do in game.
2. Arena tickets as rewards from quests + exp since they are 40 gold quest for none arena players this way. people who don't want to play arena can start and exit just to get the 40 gold, it will intensify players to try arena more and experiment more.
I hope I formatted this post correctly so it's easy in the eyes.