I'm in the final stage of releasing CPT 4. As previously announced there will be a free and a paid advanced version. This might sound strange or surprising, but I would like to ask you for your opinion which features should be reserved for the "Advanced Version" and what would be a reasonable price.

The release candidate version is 99% feature complete. The biggest change is the new training module. A show stopper issue just before releasing this new version stopped me from including the last big new feature: new chess pieces. So, this will be saved for the final release.