Here's the permalink to the eBooks tweet. Sounds to me like digital sales are completely off the table until the Kickstarter stories are done. On a related note, there are no plans for an OOTS omnibus right now because color printing is expensive and (reading a bit between the lines) economies of scale don't work when you print two separate editions.

Ultimately, I think it all comes together to say that the Giant would rather have a single definitive version of each story to sell, rather than juggle supply and demand for multiple editions of the same content.