new vSAN feature -- which versions will get it??

Supposedly the new vSphere 5.5 vSAN feature is in BETA and everyone can try/use it.

Whenever it goes GA does anyone know which users will be cut off from using it??
That is, will it only be given to Enterprise Plus users or to Enterprise and Standard also??
It is so much better than VSA despite relatively more work to figure out networking that it should be for ALL versions...

Thank you, Tom