Since i'm late for the mail sack, I figured I might just share it in the fourms.
If there is splitscren, and I hope there is, something I would personally like to see is a guest system(Regarding XBox Live, as I do not own a PS3/4) simmeler to a game called Dungeon Defenders, where, since gear and leveling said gear is so important, a guest can simply select a guardian from the person who has the XBox live, and play off of that character, instead of having some sort of other system. This way, a guest can still level their gear, and progress through the game just like any other guardian.
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Split screen has been confirmed non-existent in Destiny... But we can get it back. http://motoringcrunch.com/news/e3-destiny-wont-support-split-screen-co-op/10018002/