I expect to publish my new novel, The Ark, before the end of February, on the ASSTR website. It will be published there in all formats (PDF, ePub, mobi, azw3 and HTML) simultaneously. For the truest read of the novel, as it was created, the PDF is the only answer. All the other formats are conversions. However it is worth noting that the HTML conversion may be the most useful, though none of the conversions are fully faithful to the original. The novel will not be included in my collected works for a few months until I am confident most of the errors have been excised from the text.
As to how long ASSTR remains on-line, it is anyone's guess.
Once again for a variety of reasons, both technical and legal, the novel cannot be published here. I wish that it was not the case as I would love to post it here. I suspect our host here, at least partially, shares my sentiment, but on the legal end his hands are tied. On the technical end, my text remains outside the formatting provisions of this site.