I am not sure. I expect that those that they want to interview will recieve an email/phone call/ or letter prior to 4/15. The website is back up and it says interviews are in early April. Final Selections are made by 4/15, so only a few more weeks of waiting.
I think the website said they only give out 25 or so interviews and that they get a little over 200 apps a year. Not good odds.