I spoke with technical support at Diamond and here is what Diamond means when they are no longer supporting POW (Previews On Windows). The POW file will continue to be generated for the forseeable future. The POW program will probably continue to work. But if you need technical help, or something breaks, Diamond is going to either not assist, or may assist, but encourage you to move to ComicSuite Ultra Lite.
So what does that mean for CBPF users? Anyone can continue to use the version of CBPF they are using. If you do transition away from POW, CBPF is there ready to help. It supports the CSUL format as well as the MDF (Master Data File) format file. And the POW support is still supported in the latest version of CBPF.
There have been hickups with rolling out the 2.xx version of CBPF (as I knew there would be) since a different version of MS Office is used and the database format has changed. I very much thank those stores who have upgraded and been patient in the upgrade process.