The Basic Rules have been updated to include two new spells and added some appendices More important there is now a Dungeon Master PDF with encounter building guildlines, monsters, and magic items! Not a complete list by any means but enough to get started.
One thing I noticed right off the bat in the DM guidelines is that there a section of what are in essence NPC templates. You combine those with the race or humanoid monster of choice and you have a fleshed out basic NPC.
Arkham City Part 9: Surprise!
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