I rechecked - in the revamped US store it does show on which devices you can read book.
So from the previous thread the deduction would be
if it has listed
Quote:
Desktop / eReaders / Tablets / Kobo Vox / Kobo Arc / Android / iPhone
|
means it's epub
if it has listed
Quote:
eReaders / Kobo Arc / Android / iPhone / iPad
|
it's a kepub
or something to that effect