Well, sometime in the last -- day I think? -- Kovid created a new development branch called "spell" which contains the beginnings of dictionary implementation. So I think we will see this pretty soon.
Metadata editing can already be done in the GUI, and calibre will update the metadata if you open the book from the library. Not sure if/when that will be added into the editor core. Clips are planned, but I'm not sure when.
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