Supporting HD-Burn will require that LiteOn pay licensing fees. I don't think they'll be shelling out that kind of money unless there is real demand for HD-Burn.
Problem with HD-Burn is that it's not very compatible. Most drives and devices can't read it. You have to read it in the drive that created it. HD-Burn, IMHO, is a flop. And unless it gathers massive popularity and momentum, most companies will ignore it.
On another note, HD-Burn, because of the smaller pit sizes, requires DVD-burning hardware in order to work. It's a feature for DVD-burners, not CD-burners.