Looks like there's a new catalog.
http://mthtrains.com/news/589
GS series has the smoking quillable whistle!
MTH-OneGauge-Catalog-2017.pdf
Update:5/1/18 --- Two GS4 paint schemes have been **CANCELED** due to not enough pre-orders.
- 70-3032-1 - All black SOUTHERN PACIFIC GS-4
- 70-3035-1 - All black BNSF GS-4