If you haven't heard, there was a screenshot posted on Reddit, which showed a new bonus coming for subscribers. Coming in update 14, subscribers will receive double bank slots while their subscription is active. This is awesome news for us hoarders :)
The original post is here:
And Gina from ZOS has confirmed that this is correct. You can see her post here:
https://forums.elderscrollsonline.com/en/discussion/comment/3964253#Comment_3964253