There is a list of some changes on the purchase page here

These are some changes that might not be listed there

Removal of combine figure, find unseen polygons and reduce poligons, Path Palette from figure menu

Removal of Path Palette from object menu

Removal of path palette, keyframe category list from windows menu

Update python to version 3

Remove links to websites from help menu, many of which are now closed

Faster superfly renders

Updated cycles render engine

Added denoiser

Added adaptive sampling to superfly

Added post effects to superfly

Added choice to render over background image or transparent background

Simple tab in materials room changed to assign tab. It allows you to add an mt5 material file to multiple material groups at once.

Option when switching an image in the image node, the image texture node in cycles, or the environment texture node to change the same image for all instances of the image in that material group, any material for that figure, or for the entire scene.

Updated nodes for updated cycles.

Added principled bsdf and prinsipledhair bsdf nodes

Improved search function in library

Search Renderosity and Posersoftware stores from library

Purchases tab includes content and purchases from Posersoftware as well as Renderosity marketplace. It is not required to use this, but it is available.

Some of these might be duplicates of the market place listing. I didn't compare my list with it too closely.

As randym77 said, there is a 21 day trail you can chack it out and see if the changes are for you.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
Check out my store here or my free stuff here
I use Poser 13 and win 10