Eugenia says in her blog: (http://eugenia.queru.com/2010/10/08/h-264-performance-on-vegas-pro-10/)
For those who prefer the old way of doing things, like, converting to Cineform, you will also be glad to know that Vegas (Pro 10) now uses the Cineform SDK to decode Cineform files, rather than the old “Video for Windows” API.

What will that mean in practice for Vegas 10 Cineform users?

No more 8-bit truncation, and fast decodes, and deep encodes -- if you have a NeoHD license or better.

Any advantages for NeoScene users?

Some yes. Vegas will use the CineForm decoder SDK for deeper precision access.

Deeper precision access implying more accurate mapping of the Cineform codec colorspace by Vegas? Which would seem to apply both on decodes for preview and decodes for rendering...

Don't mean to be too granular here, it's just that this seems to be the first acknowledgement by Sony that the CF technology has evolved from the codec that was available for Vegas 5/6. On the face of it that's a good thing, and seems to continue the departure from the VfW-centric decoding that Vegas used historically, and not just for CF.

But, apart from theoretical goodness that a codec-maven such as yourself understands much better than me, I am very interested to know what this may mean for me and other Vegas / CF users in practical terms.

Basically you get at the 10 and 12-bit data, rather than truncating to 8-bit.

Yay!!!! If this turns out to be true, I'll finally be purchasing a license of NEO along with my Vegas upgrade.
Though I forget which version of NEO supports 4:4:4 color space.

Vegas 10 crashed when i've choose render mp4 1080p60 and mov 720p60 to Cineform template.

Application Version: Version 10.0a (Build 388) 64-bit
Problem: Unmanaged Exception (0xc0000005)
Fault Module: C:\Program Files (x86)\CineForm\Tools\CFHDEncoder64.dll
Fault Address: 0x000000003B1126CF
Fault Offset: 0x00000000000226CF

Application Version: Version 10.0a (Build 387)
Problem: Unmanaged Exception (0xc0000005)
Fault Module: C:\Program Files (x86)\CineForm\Tools\CFHDEncoder.dll
Fault Address: 0x25DFF8F5
Fault Offset: 0x0001F8F5

No problem render to Sony YUV, mfx, Sony AVC and so on...

Does this mean that I don't have to check the "i-frames only" box if I want Vegas 10 to smartrender?

That is up to Sony, it was never our limitation.

Thanks, David. Possible bug in vegas aviplug.dll ?
Well, have solution: render to uncompressed -> cineform.
In this case used old VFW?