This is pretty much what a "small pool" email. The email basically says that the admission committee has reviewed your application and has put you in a pool of applicants that may or may not receive in interview. The interview is from September upto May.
Pretty much this is what the process is like for this school. Once you give your secondary, you get an email to say you are complete. The next email you would get would state that your application has entered primary screening. After that , you could either get an email of either being "Small pooled", or maybe an interview invitation, or possibly a rejection email. Typically most people get a small pool email after the primary screening, and then an interview. They usually notify you through email if you are small pooled or get an interview. Best wishes, and I think most applicants should hear something from them in a week or two. I think it has been a while since they sent out interviews. My guess is that they review applications in groups and then send emails out on a particular day whether it may to mark complete, screening, small pool, interviews... etc. Hope we all could hear something good!