I couldn't find anything through a Google search or on Epson's own site as to what has actually been improved, if anything, in the ultra version. Oddly, it looks like the basis weight has actually dropped, so I guess that does let them call it a "new" paper.
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I doubt if anything besides the name has changed, just as for Epson's "Ultra Premium Presentation Paper Matte" which used to be called "Enhanced Matte Paper" and before that "Archival Matte Paper", with no change to the paper.
Epson seems to get tired of their paper names periodically, and the marketing department has to come up with new names, which of course confuses us poor photographers no end.
I now have to look at a carton and write down the name before I go shopping because I can never remember their *&^%$ paper names any more.