From what I remember, Amtrak did the same thing last year. The menu technically changes every six months, usually May & November, & they had pancakes during the slower half of the year (November-May) and Railroad French Toast during the busier six months. I hope that means that the French Toast will come back this May. In general, it seems like the summer menu has better food items than the winter menu.
Of course, it seems like a lot of dining-related issues have gone downhill, & not posting the new menus seems like part of that trend. So, I don't have my hopes up too much.