Epubs don't go into Indesign; they come out of it. So, sorry, no, you can't open an epub in indesign and create a pdf.
Now:
If you start with an Indesign file, yes, you can output both an epub and a pdf. I haven't done anything with reflowable pdfs yet, so I can't say how effective it would be to start with the same source. Indesign's take on epub is fairly rudimentary, though it does do some cool things (like embed fonts - easily).
Adobe's workflow seems to be:
Word-->Indesign-->epub.
I think, though, there would need to be some modifications to the middleground file to make an effective pdf - it could use more cool indesign tricks than an epub can.
Both TeX and pdf are print-oriented. Epub is something different - not quite web, not quite a paper book.
-bjc
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