Border's announced Friday that its new eBook store will open for business in June, and that it will attempt to serve a wide variety of eBook readers (not just Kobo, of which it owns 20%).
Furthermore, "(d)espite Borders' close relationship with Kobo, which is a spin-off of Canadian bookseller Indigo Books & Music Inc, Borders will not limit itself to Kobo's device after it retrofits its stores to create display space for as many as 10 kinds of e-readers that will connect to its e-bookstore."
http://www.reuters.com/article/idUSTRE6466C820100507