The two storefronts next to Willie’s Dawgs on 5th Avenue between 5th and 6th streets are about to be home to a couple new businesses. According to a sign that’s gone up, one will be a new pizza place called Prego’s. Contractors working on the store say it’s supposed to open very soon. More exciting: A poster on Brooklynian says there’s word the storefront next to Prego’s will be a banh mi joint, and a store owner on the block told us he’d heard the same rumor. GMAP