I just picked up a Texas brisket sandwich from the cart on 49th just west of 6th (formerly of 50th). The guy told me they have a cart out at park & 47th, and that they will be opening their expanded, full service restaurant at the 11th Ave. location this Saturday.
I don't know if this is a new addition to the cart, but it's new to me: they've added small sides (same size as the slaw container) of Cajun dirty rice & beans for $1. I can't recommend it. Bland & lackluster.