Mark E. Stenroos who is absolutely reliable in this matter claims that the Beethoven and Bruckner cycles have been newly remastered.Apparently the 60s and 70s boxsets of Karajan's work on DG feature some remasterings of key things such as the Bruckner and Schumann cycles.
Pain in the bum that you need to buy massive, expensive boxsets to access these remasterings and a pain in the bum that DG can't be bothered to be clear about what they have and haven't remastered.
They've also reissued the Karajan Symphony Edition in 2014 - apparently NOT using the remasterings used for the 70s boxset. Again though, this isn't made clear one way or the other.
Anyone know anything about all this?!