To say Apple's launch of their latest iOS 8 update hasn't gone very smoothly is an understatement. One of the worst possible outcomes occurred from the iOS 8.0.1 update: it stopped cellular connectivity (as well as TouchID functionality). This lead Apple to issue an apology and crank out a quick 8.0.2 update, which they have begun pushing out today.
Ironically, most of the issues with the 8.0.1 update occurred on the newest Apple device, the iPhone 6 and iPhone 6 Plus. According to Apple, less than 40,000 iPhone 6 & iPhone 6 Plus devices were affected by the trouble. That is still a significant number of unhappy customers with new iPhone 6 variants which are basically useless without rolling back to the previous iOS 8.
Sadly, all is not rainbows and unicorns yet in iOS update land. There are already reports in Australia of users still experiencing the same issues, even with iOS 8.0.2. It doesn't look as wide-spread as the 8.0.1 update problems, but we can't imagine Apple is too thrilled about it.
You might consider waiting to update until after Apple has completely ironed out all of the bugs.