I know that it's a beta, and therefore bugs are present, but in some way we as developers are forced to test it and report those back to Apple in order for them to fix the issues.
So, here is my list of bug and unwanted behaviours
1)
A strange thing that i found is in the Photo-APP. I made some pictures to see them in the APP. Then I tried to delete the picture before the last one, but the APP always deletes the last picture. This doesn't seem to happen by deleting arbitrary pics, but only the pre-last. (Fixed in Beta 3)
2) In the Contacts-APP the list of initial letters (right side of the screen) doesn't seem to be aligned correctly3) Skype... isn't working at all4) Don't put a picture with a light background in the
lock screen. It just disables you from seeing the controls
5) In some Apps (for me the synology apps) that use the popup to ask for the credentials, there are just no inputfields. This means that there is no space to enter them and you're basically not able to login6) Now in the latest Beta 5 you'll see all the birthdays one day earlier than they really are. My contacts APP is telling me that my birthday is the 18. of September, but in the Calendar I see it on the right date. So by restoring it for displaying in the contacts they'll make some kind of mistake
I'll put more of those as soon as I find them.
All in all I like the new look and feel of the OS and even the new functions are nice, however there is still a lot of work for Apple until they can distribute it to the market.