I suspect that the Photographers membership still brings with it a full Creative Cloud membership which gives 20GB. Users would not be happy with a paltry 2GB in a paid sub and IMO Adobe would be making a huge mistake if that is the case.
I suspect that Adobe are trying to differentiate between the S9.99 PS/LR package and the more expensive $19.99 Photoshop CC single app. For me PS+LR+2GB of storage for $9.99, is still no contest against $19.99 for just PS+20GB of storage+Behance ProSite.