Thank you for your interest in Sitefinity 4.0
We are going to have such feature - to create custom types of content from the UI. You are also going to be able to add new meta fields from the UI. However creating additional types of content is not available in Sitefinity 4.0 CTP.
We are going to have a e-commerce module for Sitefinity 4.0, however it might be included into later releases - such as Stefinity 4.1.
As for the Community Edition - it is not decided yet. If we have one however it is not going to be released together with the other edition -it is going to be on a later stage.
I hope this answers your questions. I you have more, please feel free to contact us.
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