I wouldn't expect any big improvements, if any at all. Of course, the RIGHT thing to do would be to finish development of the game properly. But in reality, the game has sold over 10,000,000 copies, the vast majority of the sales it's ever going to get. Continuing development is just throwing money away. As a business decision, it makes perfect sense to say "Well, ten million people can't be wrong! It's finished! Thanks for the cash!"
It's a scumbaggy thing to do, to basically just take the money and run, but it wouldn't be the first time Early Access flash-in-the-pan devs demonstrated themselves as being capable of such a thing.