Thunderbolt question

Hi everyone, I currently have an HP Z1, and HP announced the Z1 G2 at CES.

The most interesting part for me is at 1:20 where he mentions that the two Thunderbolt 2.0 ports are an add in module that is optional.

My question is when this machine comes out could I theoretically buy one of these modules and put it in my current Z1? or is Thunderbolt depended on more hardware like a certain GPU/CPU/Motherboard. Additional info seems to tell me that the Thunderbolt ports take place of where the DVD/Bluray drive would go so I wouldn't mind losing it (haven't use that slot since I got the PC).