Look closely at the items on the menu, there are a mix of what I would call breakfast and lunch items on there. It seems, based on this fairly recent (< 12 months old) thread https://www.disboards.com/threads/grand-floridian-cafe.3557890/, that it is the same menu at both breakfast and lunch.
Thank's for the recommendation. We tend to get into the parks early and like to get out of the Magic Kingdom by lunch for better food and a relaxing atmosphere but not travel too far. I'm not a huge fan of the Wave and the Kone Cafe has been the go-to for too long, so definitely looking forward to the CF Cafe.