I watched this the other day - a good and informative seminar from Pete Brown and guests (Propellerheads, Bitwig). The comments section underneath is also worth a read through - not only because, Pete Brown himself responds quite candidly to many of the points posted. Some interesting stuff.
Bottom line, the audio improvements are WASAPI/WDM based of course; this means diddly squat for ASIO users. Steinberg are the only ones in control of that protocol.
MIDI improvements on Win 10 will be interesting going forward, as Class Compliant drivers from 3rd parties, eventually get updated (i.e. Yamaha, with their UR series of hardware…)