No. Sony removed Cineform support from Vegas altogether instead of updating their old licensed Cineform codec (which now has compatibility problems with the newer versions of Cineform).

The only way to read back your old AVI Cineform files is to download the freeware "player" codec from Cineform's site and pray that you won't get the said incompatibilities: http://cineform.com/products/Downloads/DownloadNEOPlayerStart.htm

If you want to create Cineform files, you need to buy the NeoHDV (1440x1080) or NEoHD (1920x1080) encoders from Cineform directly (they sell them $100 off list price if you are a Canon HDV HV20/HV30 consumer user because Cineform recognized this new amateur but artistic community around these well-sold cameras). I personally use Cineform's NeoHD.

Sony believes that M2T is good enough for people's needs as an intermediate solution. I personally, characteristically and categorically don't. M2T is not a lossless (or visually-lossless) codec like Cineform is. Since I bought my 1920x1200 PC monitor to edit my HDV footage in 1:1 size I could see HDV's artifacts in all their glory. The fact that Platinum9 can export to M2T without re-compression is irrelevant as this is only relevant if your video is actually HDV (AVCHD is soon to be more popular than HDV's M2T), you didn't use plugins, pan/crop, transitions etc.

If you need a free alternative of an intermediate codec, download Lagarith: http://lags.leetcode.net/codec.html
Lagarith is good as an intermediate solution, it's truly lossless, but it creates 2x-5x the file size Cineform does, and it's very slow to playback (which can make editing a pain in the butt). It works, but you get what you pay for.