I'm interested in learning what it is specifically about the SVR2 system that you are curious?  As Warner pointed out, the reference system ISA for the folks in Summit, NJ started changing from the PDP-11 to VAX at that point.  By SVR3 it became a WE32000 and by SVR4.2 it was the Intel 386.

Besides the ISA changes for the core kernel and the collection of supported user space programs, SYS V took a number twists and turns [for different reasons, some in hindsight, proved questionable] - but nonetheless.

Other than the native support for the Vax, IIRC there really was not a lot special in SVR2 - while SVR1 and SVR3 [and later SVR4.2] were actually substantially different from their predecessors.