I just notice this morning that my phone hand't updated any apps and I couldn't download any new ones.
There are a few threads on the Apple boards so I don't think it's the apple store.
One recommendation is reset all settings, I did that and it seems to have worked. I updated one app and it is ok. But it's a pain as now I am resetting all my settings.
Not the end of the world, but another dent in the iOS 8 updates. This one was a bit of a dog.