Yup and I've got em installed. Figured it out though. I had to keep resetting Reaktor's midi input setting to Omni until the "silent synths" would see it and remember it. It took several times but finally worked.
Also, for anyone using Komplete Kontrol in Sonar (which is acutally pretty neat and for just quick control and playback better than K5) but, again, you've got to make sure on most instruments that your midi input is set to Omni...at least I do. And on the Komplete Kontrol screen the normal control bar like in Kontakt is hidden and there's a little icon you have to click to get it to appear. Then you can easily set your midi to Omni and, viola, your triggering sounds again.
Another thing to watch out for with the new pianos in Komplete 10 is they take a bit to load up and the tiny little white line that shows load time is not very noticeable. Just an FYI.