Onyx Box's Russian distributor has announced a waterproof variant of the Kepler Pro, the
Robinson Crusoe. (This will probably mean that it'll also be available from their US subsidiary.)
So it looks like, although early reports of there being a waterproof Kepler were in fact accurate, anybody foolhardy enough to read their base-model Kepler Pro in the bath is likely to have their story come to a sudden halt.
[Hat-tip: the-digital-reader.com & .the-ebook.org]