There's a new, unofficial class of champions called Juggernauts. These champs can build almost full tank and still do fucktons of damage. These champions are:
Nasus, Trundle, Garen, Darius, Volibear, Illoai, Skarner, and Mordekaiser.
And food for fun, Nasus jungle is no longer viable. His W range got nerfed, and his stacking power got nerfed. Nasus now goes top and afk farms for 25 minutes (metaphorically).
Trundle and Mordekaiser do actually need to build damage items though.
Tanking is practically impossile now. AD is running rampant and AD champs have enough armor pen items now that they can fill all of their item slots with armor pen.
Deathfire Grasp is gone, Sword of the Occult is gone, Mana pots are gone, flask is gone, Mejai's gives 25 stacks now and grants 4 stacks for a kill and 2 stacks for an assist, Homegaurds is now global and is given to everyone at the 20:00 mark, minions snowball, games snowball in general, Fiora is now broken as fuck, AP Alistar is viable and it one-shots people, Sion got a massive rework but it was nerfed so now he is trash tier, Shen got reworked, Poppy got reworked, LeBlanc and Fizz still exist, Master Yi and Jax are more cancerous than ever, Maokai got nerfed, Taric is getting reworked, Ao Shin is getting released soon, Heimerdonger got updated, Rift Herald is at Baron Camp and despawns 15 seconds before Baron spawns, Baron spawns at the 20:00 mark now, Teemo still exists, Graves is now a jungler and is broken as fuck, Nunu can perma-slow now, Miss Fortune is broken as fuck now, Riot has replaced logic and reason when it comes to balance with overwhelming stupidity and arrogance, there was no 2015 Harrowing because Riot had to spend the time on Worlds, Cassiopea is trash tier now, Rengar is still cancer, Blue Ezreal, Yorick will be getting reworked after Taric's rework is released, Vayne still exists, Lee Sin still exists, Kassadin got a massive nerf, holy shit I lost count of what happened, I can't remember anything else- oh yeah Veigar's stun is no longer instant and his damage got nerfed. There's still a lot more shit that happened.