Congratulations to the Wasabi and JoinMarket developers! JoinMarket pioneered a lot of CoinJoin science (and BTW, belcher wrote an excellent & comprehensive wiki article on privacy), while Wasabi is the first wallet that implements CoinJoin in both a highly-usable and sound way. As both a signer and a donor to the CoinJoin bounty fund, I'm thrilled that these two pieces of software exist!

For everyone looking to improve their privacy, I highly recommend checking out Wasabi, especially over centralized "mixers".

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Further work is still necessary toward achieving default-fungibility, which is IMO the end goal. Even with Wasabi, you need a fair bit of expertise to maintain privacy, and the vast majority of people are using wallets that are terrible privacy-wise. Without intending to say that the bounty fund will reward people for these specific things, I'd personally like to see:

 - Improvements to make Wasabi more of a complete wallet.
 - CoinJoin integration in other wallets, especially Bitcoin Core.
 - Research on doing CoinJoin in decentralized ways. (Wasabi's method is pretty secure, but requires a centralized coordinator.)
 - Other research (and, perhaps more importantly, usable products) for improving day-to-day privacy.