Guess I can answer some of them.
(1) I have no idea when the epub comes out, it isn't out because I rejected the current quality. We haven't produced the epub ourselves (we have done so for the PDF) for a number of reasons.
In all honesty, I believe the best digital version will always be the PDF not the epub, unless you think our prose is a novel (which perhaps in a few places it is :-). The problem is that you can then read it on a small device (even your phone) but you can't directly use the examples, because they are going to be graphics (because otherwise an epub would be mangling the example output and that would be deadly for the purpose of the book. And, of course, the typographical quality is, say, sub-optimal, which for a book that tries to show of what it documents is a bit of an issue. The PDF on the other hand, already works fairly well on smaller tablets (see recent review in TUGboat on that).
If you want both the print and the digital then I would buy them directly from the publisher as there is a nice bundle price. See the LaTeX project website for more information. If you are a TUG member then going via tug.org gets you even another reduction. Getting it sent to Europe is not so bad and worth doing if you are interested in both. From Pearson you get both the PDF and the epub (when it comes out finally) in other places most likely only the epub or the kindle (and not as a bundle with the print edition).
If you just want the digital then again going via the publisher is imho the best option.
If you just want the digital I would also do it via the publisher because of getting the PDF without DRM.
(2) yes a few (and only noticed most likely because I make this public) but none of them are in any way major (I record basically everything, include misplaced commas). Which explains why the file appears to be large. Anyway, I can (more easily) produce a new PDF but the print run is a different matter. I'm sure that the first one holds out until another Xmas unless many, many people suddenly get convinced that buying good books (or say books :-) is worth doing. So don't wait for such a reprint if you are interested in the material.
Furthermore: I manged to convince the publisher that such a book deserves a good hardcover and also ribbons (which I find extremely useful, but which are basically not used in the US these days). That limited a bit which printer/binder could be used and I was only able to get an assurance that this will be the case for the big first printing and it is totally open for later ones (and at least the ribbons are likely gone).
Guess that is roughly the situation, hope it helps.
