It's obvious from that picture that the big announcement is Solari boards to be reinstalled in all stations.
(or it could just be the AGR spring promotion)
The return of the Solari boards has a probability of zero. If we are going to suggest possible announcements that are NOT going to happen on Monday, my entry is:
"In a move that surprised many on Capitol Hill, Amtrak and Congressman Mica issued a joint statement that Congressman Mica was resigning from Congress and will be taking a position at Amtrak in charge of the Food & Beverage department".
No, it is going to be a mundane AGR promotion announcement. Or a website upgrade. <yawn>