Yes, First get the Trial, Check what is new. According to posersoftware the main updates can't be seen by the users

While some of these changes are not really that visible, meaning you don’t see them as a completely new feature in Poser 13, they play a very prominent role under the hood, and that will make it easier for us to implement new features down the line.

So these might come in the years to come to really offer changes. My personal opinion is that I am not planning a Investment into a Update that has updates to make updates that are not jet released and that are not seen. So it is to see what worthful updates will come after this update to be able to update later on.

Till then will sit and wait hoping that the update is not a update to be able to update to Poser 14 :) The Trial will tell !