There was not much news recently about Elrog tubes. Reason is that sadly Elrog struggled financially and was forced to enter the insolvency process, but on the bright side, great news is that Thomas Mayer will continue to produce and distribute them , as he founded a new company Deutsche Elektronenröhren Manufaktur Gmbh which acquired all assets and machines of Elrog.
Link: http://vinylsavor.blogspot.si/2016/08/the-future-of-elrog-tubes.html