Quanta BMS T4048 and BMS T7032
Introduced Nov 16. 2016
Data sheet is silent on switch chip. Cumulus says it is Tomahawk.
You can buy the T4048 switch from Colfax-Intl. Web price $7095 on 20 Feb 2017.
A trade press article at introduction.
There is a data sheet for the BMS T7032.