What was on the vf4 disc that Shenmue 2 had???

i still dont know 100% what was on it? is it just a kinda of homage as vf3tb had a shenmue/berkly disc with it? or was it cos they was thinkin of doing vf4 on dc? please tell me also if its worth getting

 

It has development footage and sample fights from the previous VFs as well as VF4. Overall it's less than spectacular, but worth it for VF fans.