Yesterday saw the release of Prison Architect: All Day And A Night Edition from Introversion and Double Eleven for $39.99. The new bundle includes Prison Architect alongside the brand new All Day And A Night DLC.
For those who already own the base game (and you should: our review), the new add on can also be purchased separately for $9.99 bringing 8 new wardens, 8 new prison maps and 8 new plots to build on your prison experience and bend the rules. However for those who pre-ordered before July 1 or supported the game through the Game Preview Program, your copy should automatically upgrade for free, no prison riot required.
Source: Major Nelson