I'm not sure if this is still the mass shooting thread or not at this point, but here's what I've gathered so far.
1. Been planning this for about 6 months judging by when he bought the guns.
2. Wired up his whole apartment so anybody that goes in will set it off.
3. Set his stereo to start blasting music right at midnight. Police were called immediately
4. His attack started at about ~12:40 or so I'm pretty sure his plan was to have police bust down his door around 12:20, blow up, and have all of the first responders busy dealing with that initial explosion.
5. Pretend to receive a phone call during the movie and walk out the emergency exit of the movie theater, prop it open, and come back in fully geared up.
6. Shoot people
7. ????
8. Profit