Kobo's advertising is fairly clear that there is no glass.
I think they mean above the e-ink screen and refering to clarity. Not the substrate.
However, this statement will be taken to mean that there is no glass in the entire device. As such, Kobo will be responsible for replacing any 'no glass' device where the glass breaks, even after the warranty period. This of course, depends on the power of your local consumer protection department.
This must be a difficult question to answer, as it has now taken Sameer several days to post a response to his own post saying he'd look into it. If it is difficult for Kobo's rep to get an answer to this question, imagine how difficult it is for us consumers.