New update:
3 new regular civilizations added: Piantas, Nokis, and Doogans. Piantas and Doogans will form bandit groups in Adventure mode and attack Koopas and Shyguys in Fortress. Be especially cautious of Piantas: just because they go into battle unarmed and wearing nothing but short skirts doesn't mean they're pushovers. They're troll-sized, and get combat bonuses as long as they're outside. In Fortress mode, lure them underground to make them lose this edge. As for adventurers... good luck
2 new item thief civilizations for Shy Guys to trade with: Squeeks and Bandits. Squeeks carry clothing and food, and Bandits carry metals. Non-thief races should watch out for Bandits, they show up in the summer and are bigger than the average skulker.
2 'challenge' races that have a small chance of attacking your fort late in the game: Shroobs and Machine Mades. Shroobs are unintelligible ray-gun toting babysnatchers that can use their infectious spores to turn your civ members into crazed lunatics, brain-dead zombies, and mushrooms, while Machine Mades are brutally powerful robotic monsters that will siege and burn your fort to the ground. Prepare for a tough fight!
With all these races running around, it might be time for getting rid of the vanilla entity file. Pay attention to your neighbor list on embark though: depending on what part of the world you're settling in and what climates the continent is connected to, there's a decent chance that you won't wind up with access to all of these races at once.
Some bugs have been fixed: Most importantly, Koopas can now withdraw into their armor in Adventure Mode. Frog Drinks have been changed into alcoholic beverages, so they will actually work now, although the powerup time will be only half that of food-type powerups (since creatures drink more frequently than they eat). Boos will no longer show up in random locations, as they have been restricted to roaming wild in evil locations and attacking travelers at night.
Chomp Shells have been made two-handed in order to balance them out, and a new one-handed version has been added: Mini Chomps, which have about the size and power of a regular flail/morningstar/whip. They are both highly versatile weapons, combining a bludgeon, blade, and whip in one. Make your Koopa adventurer a Macekoopa for a chance of starting out with one.
Toads are, on average, tougher than before and won't get pulled to pieces quite as easily. In exchange, their recuperation speed has been lowered. They are still pretty breakable with a quick recovery time, and can still recuperate from any injury (aside from losing limbs) with sufficient bed-rest. In addition, Toads will no longer be restricted to starting out with wooden weapons in Adventure Mode (the wood forms of weapons have been turned into training weapons). They will also build castles and fortifications in worldgen.
Yoshi behavior has been changed. They will no longer hunt vermin (although they will gobble them if they happen to cross paths) or adopt owners. Instead, they will eat from stockpiles like regular citizens. If one of them eats a Yoshi Cookie (made in the kitchen from cake mix and a melon), it will gain stat bonuses for the next month.