Routes of VB were always a surprise. IR will try to introduce VB in new routes than replacing existing Shatabdi trains for time being.
Making a wild guess I think new route can be between ERNAKULAM - CHENNAI CENTRAL/KSR BENGALURU.
05...
more... 45 ERS 23 30
08 45 CBE 20 00
14 00 MAS/KSR 15 00(Approx)
Halts at TRISSUR, PALAKKAD, CBE, SALEM.