Updated OP with MEGA link. Note: PCBeta guy said he recompiled the ISO, therefore ISO date and MD5 is different from MS original, otherwise the files are originals. The first leaked download is rar file, this one includes the boot files & compiled into ISO, other than that, I assume there is no difference.
Yup, it's just for those guys who have not downloaded yet, and for those who don't know how to compile a bootable ISO from the previous rar.