The specs seem to be a problem for a lot of vendors.
There is a Petnium version with 4 GB and 32 GB of storage, seemingly only sold by Best Buy.
There is a Core M3 Version with 4 GB of Ram and 64 GB of Storage sold by several other vendors .
And finally there is suggestion that in the future there will be a Core M7 version with 8 GB of Ram and 64 Gb of storage fro some higher price.
I have not seem this last super version available yet.