what do you mean with "really like jelly bean"?
nothing is more jelly bean than HOLO launcher
his theme is TouchWiz , maybe the most "really" galaxy theme ( Sii, SIII, SIV)
im not sure if he is using Jelly Bean, because it doesn't says it anywhere.
2 things, he could be using inspiration v17.2 ( the best GB rom in my opinion)
OR he could be using TheWhisp's JB, with a theme (but you have to do the DPI trick)
choose one from the both, in the case of nr 2 you have to ask him what theme did he put
P.S. we have somewhere a thread of a big list of themes for JB, watch there and maybe you find something you like.