Taleworlds writes: “Greetings warriors of Calradia! Today, we are moving the current beta branch to our main Steam branch. Below you will find the original changes included in the beta branch, our previous hotfix to the beta branch as well as some additional changes that we have done since. There is also an update to the beta branch. Patch notes for this can be found further below.”
Source: N4G PC Mount & Blade II Gets Update 1.2 and Beta 1.3; Read the Patch Notes