Activision have made a blog post suggestion that the curse of Osiris will feature an all new raid + Social space, Though's and Ideas of what these could feature?
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I imagine the Lighthouse social-space will be an updated version of the Lighthouse from Destiny. Could be that it was destroyed due to the [i]Almighty[/i] and a new Lighthouse was created. Considering the Vex are all about that time-manipulation, I believe the raid will be a redesigned version of the Vault of Glass -mechanics wise- but with a heavy element of time-manipulation. Atheon had it to a tiny degree but only just.