English National Opera has published more information on Candide on their website.
There is a short trailer on their weblog, which does not feature Alex but has information on the production. This is the first instalment. You can find it at English National Opera's Weblog.
Then there is a podcast with director Robert Carsen, conductor Rumon Gamba, Jamie Bernstein, Alex and Toby Spence discussing Candide. You can download it from: ENO podcasts.