Very unlikely. In my opinion, Apple just is not one of those brands to offer significant enough discounts to warrant the wait nor the hassle to go in person to the already normally crowded stores (or stay up late at night to fight with others on the website).
You are probably better served by buying a refurb Mac Mini and getting a better discount there today, as the refurb units are fixed up to be in new condition on the outside, and carry the same 1 year warranty up front (with the option to extend with Applecare, same as new).