WinFX January 2006 CTP just went live.
With it, a Go-Live licence is available for WCF and WF. Sign and deploy.
Update: They managed to screw up the download links again. Beware: If you're downloading complete installs (and not the setup manager) use the lower links for x86 and x64 images (there are two on the get the beta page).
The following links will lead to correct complete download of WinFX January 2006 CTP Runtime Components:
You can also check the file version. The correct WinFX RTC version for January 2006 CTP is 3.0.50727.154 (file size 44.488 KB [x86] and 84.464 KB [x64]). December CTP was 3.0.50727.151 and file sizes were a couple KB lower.