Restaurants in the GTA series aren't focused on unless a mission revolves around them. There are restaurant fronts visible in multiple frames in Trailer 2; we list what we can see.
Visible categories
Outdoor cafes on the strip. Rustic diners in the out-of-the-way towns. A brief flash of a luxury restaurant interior in Trailer 2. Strip-mall fast food. The entire vernacular of Florida restaurants.
Actual brand names are hard to make out on trailer frames. Returning Rockstar food brands - Cluckin' Bell, Up-N-Atom, Burger Shot - are plausible.