The only thing I really noticed, is when I'd log in just to play around on
MDE, when I'd click on each individual day I'd be given the options of: Make FP+ reservations, Make dining reservations, and something else I can't remember off the top of my head. Next to the FP+ button, there is a little picture of a lock next to it showing I couldn't do it yet, and under the dining button there was a date showing when that day would open up. For example, when I'd click on the last day of my vacation, it had Feb 6, 2014 under it, and that was my 180 day mark. I also got a magnet in the mail with my Mickey flash drive that had my dates on it, so that's on my refrigerator. I got an email from Disney yesterday, too, saying that it was time to make my dining reservations...but I got it 3 hours after I'd already made them, lol! Otherwise, I didn't notice a specific reminder, but I wasn't really looking for one either.