I would assume they would add additional pages to the vault, as it works with your friends list and currently players list.
Another possibility is that they could split the vault into three different vaults. One for inventory items, one for weapons, and one for armor.
EDIT:
Many thanks for all the replies and opinions!
Can we make it to the trending page??
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Its been confirmed comet will have a new social space. Im assuming that will include another vault. Im hoping /planning to keep all my goodies from before comet at the tower vault and all my new goodies in the new vault. Hopefully