I recall this as a serial on BBC2, which was (is?) the more highbrow of the two BBC channels available in 1978. It whetted my appetite for history, which as a boy I hated. I too Googled it hoping for a DVD set, not even a Region 2 one (I live in America now, but I have the means). If it ever comes out, here is what to expect:
An accurate historical dramatisation, not just a showcase for actors (though they give an excellent performance). Dates are shown at the bottom of the screen, so you can keep track of when this all happened. (I don't think I have ever seen that before except in documentaries, and this was not broadcast as a documentary).
There is a book (published by the BBC to go with the serial), by Richard Barber. If you can find a copy, this is an excellent companion that includes discussions on motives and factual uncertainties, and has maps, eg the Third Crusade and the Angevin domains in England and Europe.
The only "problem" with all this is that has the look of a "budget" production. But the acting and the content and authenticity are what make it! It might not work in America however, though the period 1133-1216 is part of America's history due to the migration of Europeans. I will definitely buy the DVD set if is issued!