This isn't confirmed, but I've got some info to suggest that the outdoor seating area on the pier (http://www.wdwmagic.com/Dining/Cantina-de-San-Angel/News.htm) will only be available during lunch. This would make sense, as the seating on the pier may well intrude on the IllumiNations fall out space. During dinner service, the indoor area would be available as a table service location.