these are the export options in 13.1

and here is from version 12

It appears there is no way to render png image sequences in the new version

I have put in a ticket because this is really one of the most importanr features for me as I run images through other software in batches before importing into compositor.

That is because Poser no longer deletes the images unless you tell it to.  The top where it says images path, that is where you will find the images that you create.  What you have showing is how to convert those images into a movie format if you want to.  In the past you would select a movie type and render and Poser would output all the images to a temp folder and when all images were finished it would then convert those images into the selected codex.  And if you wanted to make two different codex types then you would render those images twice or more depending.  Now you render them once and then select the type of codex you want to make, and it creates that type.  Then you can select another codex and convert those same images to the new format without having to re-render.  Space wise it takes up the same amount of room if you delete the frames afterwards.  In fact, if you really want it to perform like Poser 12 just check those 3 check boxes that are partly hidden by you pop-up. Then it will render the frames make a movie based on the option you select in the pop-up, play that movie and delete the frames.  You won't see any difference to Poser 12 if you do that.

The nice thing about the new way is that if for some reason the rendering is interrupted you can pick up from where it stopped and not have to re-render all the good frames again.  And if you have 500 frames and it gets to 497 and quits with the old method you get to redo those 497 frames again and spend that amount of lost time being updet.  The new method you just tell it to render frame 498-500 and then compile that codex.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13

Also, in the image path the change button will allow you to select where to save the images too and what format to make them.  That way you can have PNG or TIF or any of the other supported formats.  If you make movies this way, allows you to setup a scene and render and save those frames to a folder just for that scene and the second scene could be stored into its own folder or combined your choice.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13

oh ok i get it now. It also seems quite a bit faster.

Sometimes i feel really dumb all I had to do was press render images and as you said it output the images to desired folder location. then the second step is to encode images which will deposit desired encode in same folder. 

Thanks Richard60.

The change is also really helpful if you want to do a little postwork after rendering but before generating a video. I was also a little confused at first but it's a pretty nice improvement actually.