Got this from the Amtrak Unlimited discussion forum today:
Leaving NY Penn Station, 8AM (8:30am from Newark), arriving back 6:30PM.
Allentown, Harrisburg and other points, concluding with a speedy trip back to NY on the Keystone Corridor and NEC by way of the "Pittsburgh Subway". Fare: $149, tickets go on sale 10/3. Purchasing instructions and other details at the above link.
---PCJ