I got in my first 40k game in about 4 years... and enjoyed it! I ran a Khorne list with a Bloodthirster, Abbadon, Kharn, three units of Berzerkers (in two Rhinos and a Land Raider) and some deepstriking Terminators. Pretty tiny model and drop count for 2000 points at 38 models and 5 deployments, but it worked! I played against Fix's Guard with lots of tanks, veteran squads, dual Deathstrike Nukes, heavy weapon teams, and psychers. We only made it three turns, but things were pretty definitively in my favor at the end - though there was a lot of blood shed on both sides (all the better for the Blood God). A few things I learned:
Close combat is back! Assaulting out of transports, fighting first if you charge, all of the changes to hitting and AP... I like it!
Consolidating into 1" of other units is super powerful, especially into tanks. Shooting focused armies are going to have to keep their dudes spread out to keep me from tying them up/keeping them from shooting.
Land Raiders are actually functional tanks now and not just heavy transports! Lascannons are super good and getting 4 shots hitting on 3s (thanks to Daemonic Machine Spirit) is pretty awesome with a d6 wound weapon.
Deathstrike Missiles are scary. My Bloodthirster took two to the face in turn 3, taking 16 total wounds. Mortal wounds are nothing to mess around with.
Using Command Point rerolls on charge distance is nice!
I'm looking forward to having something to do with my 40k army again!