Win7 Updates installed together with IE9 Beta 1

The following two updates are installed by the new IE9 Beta:
http://support.microsoft.com/kb/2259539/en-us
http://support.microsoft.com/kb/2028560/en-us

Especially the last one seems to be interesting, as it promises to do some performance improvements for D2D.

Does anyone know more about these Updates?

Update 1

Looks like there was reason to be sceptical. This is how one of my .NET application now looks like now:

If you want to try yourself, I wrote a little smaple application: http://anyhub.net/file/directwrite-vs-wpf.zip
It renders the first line with DirectWrite and the second one with normal WPF rendering.

Update  2

I'll now try if IE9 will keep working when I remove these updates...

IE9 works without these "Hotfixes", but removing them didn't resolve my Problems.

I know, it is only a Beta, but if you install something system-wide then at least these parts should be very well tested...

PS: I tested also with deactivated HW acceleration. Still no success.

PPS: Maybe I should post my graphics card: AMD/ATI Radeon 4670 Mobility

PPS: My graphics driver just crashed when trying my own sample application... Something is horribly wrong here. I'll keep IE9 for some days and then possible remove it again...

Update 3

Looks like Mipony released an Update that fixed the isse, so maybe they had some problem with their embedd code.

But this doesn't solve my problems with my sample application of course...

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