About a million bug fixes, according to all of the changelogs. Based on the calendar and supposed new iPhones, the final can't be that far away. I plan on updating today, just haven't found time yet. I'm not sure what's new from beta 4 to beta 5.
Yeah, it's been an awfully buggy year. I've had Safari crash entirely too much, often on hand-offs from Facebook or Twitter – which is pretty common for my usage, so very annoying. Such is beta and life with beta. Here's to hoping beta 5 is much improved. Let me know how it works out for you.
I did an OTA at work yesterday evening when I saw that it was out, it caused my 5S to go into a boot loop. When I got home I tried to do a fresh restore to iOS 8 beta 5 and I kept getting the error that the version was wrong. I restored to 7.1.2 last night and I am going to try again today and see what happens.
Funny thing was my iPad when is a 3rd gen, no problems what so ever.