Much cheer was heard around the hollowed halls of the Total War franchise as a Beta for Patch IV for
Total War: Rome II was released today. The patch is expected to provide major improvements to technical and performance issues. As well as some major gameplay (such as diplomacy) and usability improvements, such as the return of the Loose Formation ability. here. As with the Patch III Beta there may be further changes during the process to address any issues or add new changes. So there is currently no official date set for when Patch IV will be released to the public.
You can find an comprehensive change log for Patch IV over
Quoted from Joey CA:"In order to opt in the BETA please follow the installation procedure:
In your steam game library, right click Total War: Rome II. Then choose Properties and select the BETAS tab. Finally select "patch2beta" from drop down list."