You can browse by either new release or FOC dates. New release browsing lets you see what was released on any given week. This is just a list of everything that was offered, and not a listing of what the store has in stock.
You can also browse by FOC date. FOC's are "Final Order Cutoff" and it's a system that is in place to ensure a store can order enough copies of a comic, it usually is set about 3 weeks before release date.
All titles in the subscription lists must be ordered before the FOC cutoff to ensure that your store is able to get copies for you.