I've never read Justice League, but I've heard/seen so many people talk about the current Darkseid War arc that I want to check it out. I'm having a little trouble finding a complete checklist though. I did find this list here on Comic Vine, but I'm not sure if it's complete. When I read Batman RIP, there were a bunch of tie ins - but maybe this arc isn't as far reaching.
It wouldn't be too hard to catch up on the whole New 52 JLA series, but do I need to do that to enjoy this event?