Minecraft wiki entry for Horse_Update, associated text: This is the last version for the third launcher available.
Because of the new launcher, this version of the game became the first that could auto-update itself.
In the update poster, the then-unused nitwit or "generic villager" can be seen next to an iron golem, along with an unknown blue robed villager.
In the poster, Mojang is misnamed 'Notch Development AB'