If they make KDE and OS integrity, There will be a more stable less bugs distro.
Maybe, the freebsd is a good choice, or operation with PCBSD.
Below is my idea:
In future, the favorite open source desktop OS will be FreeBSD
3 reasons for that fact:
1, Open source desktop OS will get 35% market share, coz most geek community will accept that OS for their desktop PC.
2, GPL like linux will lose it's popularity in the desktop computing market.
Most ideas would be commercialize for letting authors make money.
GPL/Linux for server has been good for that, coz they can offer service and support for companies.
In the Desktop market, the user is individual. It can not be possible to offer service to get benefits.
And the open source OS users are geeks who think support is unnecessary for their PC.
3, FreeBSD is stable, mature and modern through long long time development.
BSD licence is friendly to commercialization. BSD desktop OS will get popularity increasingly.

This might have been better as a poll, but realistically, I think it is too complicated. I think it would be much more simplier to pick a distro that stays up to date, and the applications might retain most of their original configurations. However, the Plasma project for Nexus tablets seems to be pure KDE.

I don't know if your post is a question or an advertisement for BSD...

However regarding the subject:
There is already the Chakra distro.
Which provides vanilla KDE desktop and software (vanilla means no custom distro specific customizations). Another special feature is that the official repositories only provide KDE/Qt software. Software which isn't available as KDE/Qt is provided in an extra "extra" repository (such as firefox, gimp, hugin, etc.)

The distro community is not so big (so far), but the distro devs are close with the KDE devs (or are the same ;o).

I'm using it and despite my newness with KDE (which I come slowly around with the help of this forum I'm quite happy!