These are legit toys, just stolen/unauthorised release. It just means that they are already in production and someone at the factory has smuggled them out (like other pre-release toys we see on ebay, and then on the global forums). The only difference this time is that we are seeing a larger amount of figures than usual.
The same happened with the first Movie Ice Megatron - there were a heap of that figure snuck out a couple months before its arrival at stores, and RK was selling that one as well.
With production moving to Vietnam this year, this might be one of the last stolen figures to make it to ebay/online-stores.