Zombie evolution is a LOT more varied now - watch out for Feral Predators, they will bite through almost ANYTHING, straight to the torso (and usually cause bleeding), and they have great senses, so they can find you easily, even at night. 3 of those at once at close range can quickly kill all but the toughest or most prepared survivor. Shady zombies (invisible at night), huge boomers (when they boomer you, you GLOW for a while, VERY bad at night). Basically, night time got a LOT more dangerous.
Zombie necromancers (raise other zombies), zombie masters (evolve other zombies into nastier zombies), a few more acid types, the list goes on... Oh, zombie grenadiers! Don't even think about dealing with one of those without a ranged weapon - they release explosive hacks (think manhack, only with a suicide vest). The elite version has a lot more of them, including one MININUKE hack. That will just ruin your whole day.
Throwing got nerfed hard just recently, but that's changing a lot, so it might not be true at this particular second.