Me too, same problem. I’m glad I did the update on one of my own sites first before one of my clients’. Renamed the plugin directory and the site came back to life but it’s not ideal is it.
I’ll have a look at it on my dev server when I get chance. Odd to release a final version that just breaks like that, my guess is that the wrong version was released accidentally.
I think it might be theme related. One of my client sites runs a heavily tailored version of 2012 and it updated and works fine. One of my sites uses Fruitful and it breaks it. I haven’t updated any others yet, I’m trying them all offline first.