Thomas McDonell is featured in this week's (double) issue of Entertainment Weekly (April 22/29) in a section entitled "LET THE BUZZ BEGIN!" Among other things, it references McDonell's involvement with Prom and DS, Unfortunately, the piece isn't on EW's Web site, so I can't provide a link - but there's nothing mentioned about DS that we don't already know.
When the Depp/DS film comes out, it should be interesting to see whether McDonell or Chloe Moretz will be the bigger teen draw. Right now she's head and shoulders above him - but a lot can change in a year. And of course, for it to really matter to the film, it would have to have a PG-13 rating and not an R...