I received FW updates for my TAs this morning (2:53:56, July 11, 2011) which updated the program to:
PTV OS: Explorer1kg6 NGP OS
App(: SARA v1.61.41.a201
A single TA now handles a Ceton card (and based on the diagnostic map) for either four or six streams.
This occured in Time Warner Cable, LA County North (Chatsworth Headend) that Los Angeles, West Valley.