Hm. Mine has the wi-fi hotspot available. It's not under the setting for wireless & networks like my N1 or Desire HD, but it's an app called 3G Mobile Hostspot. I use it all the time. A couple of things I noticed was slight lag and getting hot(both fixed by doing a factory reset), the Amazon Kindle app won't update (says "Not signed correctly" I guess it means the one that comes pre-installed), and when using the Wi-Fi hotspot after you are done sometimes it won't shut off, and only a reboot will fix it. The last thing I have an issue with is calibrating the compass. Once you do, and check the batter stats, it shows "Android OS" always using the most juice. Only a reboot fixes that too. Other than those issues, it has been a really great update. Battery life is much better too.
EDIT For the home screen issue I had a similar one. It seems for me if I have any alternative launcher installed I cannot use the default Blur one, but that's fine by me as I use ADW EX.