The update shows in desktop, control panel, windows update, history. These updates usually fix stuff like better WiFi, Bluetooth, Camera, encryption, touch, etch. Maybe they'll have a change log on the WP8 news feeds soon.
Ugg .. yes. For those that had a hard time finding this on google, key search terms are lumia 2520, storyteller beta, nokia share app, get app, there is a problem completing your request. Try again later. error code 805a0194. Also I did install the storyteller beta for windows phone 8...