This is a great & unexpected development. I’ve already been testing
I hope this is not taken as a “looking a gift horse in the mouth” situation, but I had a few improvement suggestions 
Entity Reference Rendering
This has been an outstanding issue, in that inline entity references in rich text areas are not rendered at all. It would be so helpful if we could just get the name of the entity back in simple text so context is not lost
Page settings
It would be great if we had some control on the generated pdf page itself, in particular:
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Page Size: I haven’t found any options to control the page size. It would be great if we had the ability to choose from standard sizes and set custom sizes (in mm or in)
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Page Orientation: This isn’t absolutely necessary if users are able to set height and width, but it would be a great thing to have if you were able to select A4 paper and set it to landscape orientation
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Page Margins: I have tried setting margin on the body tag, but it doesn’t seem to have any particular effect. It would be great if each of the margins could be individually set in some real-world units (mm or in)
Page Header & Footer
Since pagination is not known ahead of time, I think headers & footers need to be externally defined. A three part definition (left, centre, right) would be great, but even a single box at the top & bottom would be sufficient (some may argue even better), if it is possible to use html & css to set location of header/footer texts. Having full html capabilities in both areas would also allow access to entity information (like name and dates, etc.) which would be super helpful. To make it complete, it would be great to have access to the pagination variables (current page number and total pages).