Alexander Kluge's 570-minute adaptation of Karl Marx's Das Kapital, News from Ideological Antiquity. Marx – Eisenstein – Das Kapital, has been released and is now available only on DVD for under 30 Euros.
I don't see any evidence that there are English subtitles on the disc, but even so -- this is a truly monumental release from one of the most impressively skilled and radical filmmakers.
You can read more about it here.