Listeners, interested in composers like Hessenberg, Reger, Furtwängler, Kempff, Strauss, shouldn’t overlook this release of Karl Höller’s two, very different, symphonies:
https://www.jpc.de/jpcng/classic/detail/-/art/Karl-H%F6ller-1907-1987-Orchesterwerke-Vol-1/hnum/5340806
It’s out now for some time and I’ve enjoyed it immensely. Probably you all are aware of this release too: https://www.amazon.co.uk/H%C3%B6ller-Symphonic-Fantasy-Sweelinck-Variations/dp/B00083D4JI which I can recommend to everyone who likes the various variation works Max Reger composed.

At the German language site Klassik Heute, Rainer Janka gives the cpo recording a 10-10-10 review. So we're spoiled with choice at once. The DUX seems not to have a libretto; the cpo release has.
The DUX is sung by Polish singers in German; I don't know which tongue is sung on the cpo release :-[
http://www.klassik-heute.com/4daction/www_medien_einzeln?id=22277

According to the information given by cpo on the back of this CD-set (cpo 555 089-2) Quo Vadis was recorded live on June, 29, 2016. Venue: Auditorium of the Adam Mickiewicz University in Poznan. So, this recording didn't sit around for 12 years.

What can I say? I agree completely. I'm surprised there's no complete survey of his orchestral output available. In the 1990s? I thought Chandos was going to do the job, but only one volume appeared. So, whenever Lyrita will release some of the not yet available symphonies I'm one of the buyers. (and probably one of the few over here in Holland ::)

True, even 'minors' like Pentatone, start recording the well known repertoire. From their newsletter: With his Moscow-based State Academic Symphony Orchestra “Evgeny Svetlanov” (GASO), the Russian maestro will helm a new complete cycle of the symphonies of Sergei Prokofiev , the first installment of which will feature Symphonies Nos. 2 and 3 and is slated for release in November this year. Both the original and revised versions of Symphony No. 4 will follow in 2018. 

Well, there it is, GLASS volume 2 https://www.jpc.de/jpcng/cpo/detail/-/art/louis-glass-symphonie-nr-5/hnum/4111668
And the Barbarossa by HAUSEGGER https://www.jpc.de/jpcng/cpo/detail/-/art/siegmund-von-hausegger-barbarossa/hnum/4963361
Both to be released July, 25 (in Germany)

Announced for August, 4 (on Amazon.co.uk)
https://www.amazon.co.uk/Daniel-Jones-Symphonies-Nos-11/dp/B071VZBWWH/ref=sr_1_3?s=music&ie=UTF8&qid=1497205630&sr=1-3&keywords=daniel+jones

Agree! Never thought there was any cycle recorded by Svetlanov! When my father and me were in the USSR - 1970s, 1980s - Peiko's (Николай Пейко) music was widely performed.

Mono recording from Prague forces of this opera http://www.clicmusique.com/otakar-ostrcil-royaume-honza-opera-koci-zidek-vymazalova-veverka-jiracek-p-98357.html

Interesting release; Italian symphonism by this composing conductor: https://www.amazon.co.uk/gp/product/B071Y8QCTV/ref=ox_sc_act_title_1?smid=A3P5ROKL5A1OLE&psc=1

Instead of making overviews of music that's not on cd, I listen to music. I'm grateful there're guys like Schmilgun, von Bahr, Couzens who take risks with unknown repertoire. I'm sure there's so much music I won't get to known before passing out.

Interesting and promising. Hope this Antarctica offers a different approach, we've already Gamba's recording on Chandos.

Please have a look at the post 'Future Dutton releases?' on this forum  :-\

Hope it's not true  :-\ there seemed to be so much in the can, already recorded........

As a box set? I don't think so. I remember some releases as separate items. And I've seen some for ridiculous prices in Japan, at Tower and HMV, in the 1990s. Those were boxes with works by one composer only, say Lyapunov, Arensky etc. Strange was that the booklets only had Cyrillic and poor English text. I didn't by any of them.