I have just found the answer to my own question. The Epson Stylus Pro 7900 sample pack has a long list of the various paper sizes and codes including the new papers Hot Press Bright, Hot Press Natural, Cold Press Bright and Cold Press Natural.
All four new papers have codes for A3+ and A2 sheet; and 17", 24" and 44" roll.
I quite like the the look of the new papers. The Hot Press is smoother and with a loupe appears to have a very similar surface texture to Epson Ultrasmooth. To my eye, the loupe reveals only a very slightly greater thickness than Epson Ultrasmooth even though the weight is quite a bit more.
The cold press surface has more texture. I can only compare it to Hahnemuehle German Etching as I tend to use smooth matte papers most of time.
Until a few weeks ago I would have steered away from the Bright versions because of worries about OBAs but not now. I am really looking forward to the release of these four papers.
Ryan