That’s right, folks. That 10-proc of Flask of the Frost Wyrm? INTENDED.
To answer some questions brought up in this thread:
Mixology will work like it does now, if you know the recipe to create the flask, the flask will grant double the duration, so 2 hours in the new case.
Elixir Mastery is also being updated to work with the new flask design so for example where you got 2 or 3 extras before you will now get 4 or 6 extras.
http://blue.mmo-champion.com/12/15864859958-change-to-flasks-in-310.html