Typically the items in Eververse will change with each season or major update to Destiny. There’s been no updates mentioned for the immediate future.
As for the facets you have, you can always open them to receive items from them. Since these items would be duplicates, you can freely dismantle them for Silver Dust which you can use to purchase items from Eververse when new ones are offered.
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You can't spend facets when you have everything offered..
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