I think some features, like for instance balanced headphone output and streaming, are unlikely in future RME products. Simply because their main focus is still pro gear, plus they are a very science-based company and they seem to ignore all audiophile "fads" with no real documented benefits, such as balanced headphones. A 10-band EQ would be nice though.
That does not make sense, so they designed something just for super sensitive iem, but wouldn't do high powered balanced output for something super hard to drive full size headphone?