It really doesn't make sense to use the DuoLingo app on a computer with a normal browser. The website has more features than the app.
1366x768 is awful.
These devices don't have a hardware camera button. Hopefully this doesn't set a bad precedent for future Windows Phones. It's one of the best differentiating features of these phones.
The 635 is coming to T-Mobile. There's a press release on their news site.
That design is awesome. The old look was getting stale.