I think that when people didn't repurchase their entire record collections in SACD the way they did when cd came out the big record companies lost interest.
High-res digital is going to be downloads stored on servers. I would guess that you'll be able to burn them onto cd-rs or dvd-rs.
The current issue of TAS has an article about the QSonics Q110 music server, which is available with storage drive capacities from 250 gigabytes to 1.5 terrabytes. The latter will store over 4,000 cds in WMA format (Windows Media Audio Lossless). Cost is around $6,000 for the 250GB with 15 inch touchscreen to $9,000 for the 1.5 TB with 17 inch touchscreen. I expect the storage, sound quality and features will improve steadily while the cost goes down.
QSonics is teaming up with website MusicGiants to deliver cd quality (HD) and high-res (Super HD) downloads. MusicGiants says they'll have thousands of titles available in Super HD soon. We'll see.