I applied early round and am heading there next fall so I'll share my experience a bit:
Upper 30s female in marketing. Fair EA (thankfully stronger quant score) I bought the GMAC bundle and took online.
Applied right before deadline, invitation to interview following day. Interviewed with an alum for about 45 minutes. I think they have much more flexibility with interviews and just have to hit on certain questions. We obviously talked about Why MBA/Why Now/Why Booth, some leadership talk, a little on my background, etc.
Good luck!