I guess it depends on what you're looking for...
I have heard that Epcot is having a special Mother's Day brunch at the World Showcase Pavillion... I think it's around $46pp or 2ts if you're on the dining plan...
We will be there during the same time and we decided to go with Chef Mickey's on Mother's Day... I'm not a big fancy meal in a nice restaurant type of mom....I'd rather be whooping it up with my kids and hubby at a loud, character filled buffet...
So like I said...it depends on what you're looking for...but I'd suggest getting ADR's ASAP!!!