Barbarians may have been a little confused by the patch notes earlier when it comes to a particular Barb skill.
According to Blizzard, there’s been a miscommunication and there are no changes to Bash and it remains multiplicative and not additive. In other words, disregard the point on the skill in the patch notes.
Update from Blizzard on Bash
Nothing was changed for this and was actually an attempt from the team to fix a tooltip issue. Fixing this tooltip issue caused a multiplicative scaling issue which we experienced internally but no one else actually saw.
We fixed that issue, but it accidentally landed in public notes.
We are updating the notes to reflect this. Bash stays the same (and is still multiplicative). You may now continue shouting at the minions of hell and not about Bash.