League of Legends - Riot's Announced Season 4 Changes (so far)

The following is what we should (according to Riot) get excited for in Season 4:

• Changes to the League System.
• Fixing up some "unpopular" masteries.
• Xerath rework, Rengar rework, and a bunch of others.
• Removal of all global passives.
• "Fixing lots of longstanding [gameplay] issues".
• Changes to ward/vision systems.
• Changes to "game pacing".
• Support/Jungler gold changes.
• Deleting Teemo from League. (You wish. -Riot 2013)
• New 1v1 and 2v2 map called Magma Chamber. (coming pre-season 4)
• Geographical map changes, mainly to jungle camps, and graphics update for Summoner's Rift.
• Complete in-game and Loading Screen UI overhaul.
• Yorick's rework. Remember though, it's still only ideas for now, nothing official.
• "Some" people have been asking about the replay system. It's coming before Season 4, since it's been on the PBE for quite a while now.