Interesting that Native Instruments still haven't released Kontakt 6.
Kontakt 5 was released in September 2011. I understand Kontakt 6 is still only in Alpha testing, so it looks like it will still be quite a while before an upgraded version of Kontakt is released.
Accordingly, Komplete 11 will launch with Kontakt 5 bundled in, which all Komplete 10 and 9 users already have. I currently run Komplete 10 Ultimate and use Kontakt 5 as the sound engine for the 'home / entertainment organ' part of my virtual instrument setup. There is not enough in the K11 bundle to get me to upgrade now so I'll be waiting until an edition of Komplete is released which contains Kontakt 6. Hopefully Kontakt 6 will have an expandable (not fixed size) User Interface window to allow the proper use of larger and higher resolution monitors.
An upgrade from komplete ultimate in general means, you get all the new NI instruments released since the previous komplete release...
Thats why reaktor 6 is in the package and kontakt 6 will probably be released somewhere next year.. And make it as part of komplete 12.
Because you allready have mist instruments... You only pay €199 for komplete 11 or €399 for komplete 11 ultimate.