I have the new s8+ and the wifi issue for me....is that it WILL NOT connect with 5G wifi, but it will work with the 2.4. This is Brighthouse/Spectrum and T Mobile. I also had the s7edge previously and the fast wireless charger won't work, and online, Samsung told me I had to buy the new fast wireless charger. The included wired fast charger works just fine and is really fast!
Many users (myself included) also experiencing stuttering audio over bluetooth, see the topic "Galaxy S8 Bluetooth Connection" on the Samsung community forum. A moderator claims the problem is known and a fix is in the works but no real details given.