I'm sure if they were the HR version, the Adoroma listing would say so. B&H doesn't have them either, but you can order them from their distributor's web site, linos.com.
My guess though is there aren't any significant changes or improvements from their non "Digital" filters, they're just want to keep up with Heliopan and charge twice as much for it. For what though? It's the furthest piece of glass from the sensor so I doubt it makes a difference. The only difference I see stated in their brochure is they have "maximal optical precision" which I assume means that the glass is even thinner and flatter than the regular ones.
Do you really think that affects image quality? I'm skeptical. I know that good UV filters (like your Hoya's) are a bit more flare resistant and what not than cheaper filters, but other than flare resistance, I've never seen a difference in normal image quality difference between a $100+ filter and a $30 filter, have you? The further something is from the rear element, the less impact it has on image quality.
