I got that email earlier this week. I've been told it means the app made it out of the big stack into the small stack. If it scores well compared to the others in the short stack, you get a call. If there's something about your record that reduces the score, I've heard two things...one that it goes back to the big stack, and another told me they thought it stays in the short stack until your score is good enough to warrant a call. The only ones who go into the trash are the ones who fail the panel interview, otherwise there's always hope.