The Myriad stuff from today seems to point to 2 key things to me:
A universe reset/reboot will be required for the next update (the PDF talks about the current system capacity not being enough and the need to reallocate resources in order to complete the new model. This makes perfect sense if the update is significant and it also explains why people can no longer see the build progressing (they are working on a separate new version to be implemented via a reboot).
Multiplayer aspects (to be clear I do not see fully fledged MP coming, at least not yet). The Myriad website references the ability to send physical items to others and also mentions issues arising from being located within 1 mile of someone else. My guess here is some sort of trade system, perhaps sending items to trade depots or buildings where other players can go and collect them allowing for real trade between players.
Last thing I would throw in is the 2 above points are obviously not the main Portal related change/update/new feature - We still don’t have any solid answer on what that will be but my guess would again be MP related…some sort of specific Hub system/planet/area where player interaction is possible in some form.