I have also found donkeys, mules, bats and a witch. I encountered a zombie with full gold armor, but he did not drop it after I defeated him. Charcoal finally looks different than coal. Strangely, cows are much harder to catch now. They are as fast as pigs, but more elusive since they do not stop running as quickly. 
Also, more important to redstone freaks...
Hoppers and Comparitors!!!!!
What do hoppers and comparitors do?
A great way now to control animals is by Leads, they keep the animal following you, but if you get 7 blocks or more away from the animal it breaks.
I use this with Mooshrooms, and even chickens.
Hoppers are like a personal transporting system. They take blocks from the input end (which is always the top) And put the item in, after a couple of seconds of delay, into their output end (either the bottom or sides).
This is extreemly useful since you can carry items from one place to another, but also, they can take items out from furnaces and place them in chests, or take unsmelted items out from a chest and place them in a furnace.
A couple of really explanatory videos out there are:
https://www.youtube.com/watch?v=bnI3-20BwSE Videos 1 and 2
And those done by Sethbling, who does some extreemly awesome things with Minecraft, especially Command Blocks (Including his most recent mini-game called Missile Wars, which if you like to expand your minecraft adventure I would highly reccomend checking out).
https://www.youtube.com/watch?v=uE2iRkoLH7Ihttps://www.youtube.com/watch?v=tT_nwbqMYgUhttps://www.youtube.com/watch?v=a92_VBLTjAQAlong with many many other useful and explainative videos about Minecraft.
Comparitors are just like Repeaters, except they put out a varied signal. Allmost every redstone signal producer puts out a signal of 15, and decreases by 1 every single block a signal is traveled.
What a comparitor does is that it takes 2 signals, from inputs A (the rear face of the comparitor) and B and/or C (one or both of the side faces of the comparator) respectivly, and puts out a Signal D (the front side) of the comparitor.
The basic equasion for its output is: A - MAX(B or C) = D, If D Less than 0, then D = 0.
Basically, you take the signal from the rear end (A), and subtract the highest input out of either side [MAX(B or C)], and that equals the output (D), unless of course the side inputs are greater than the rear one, in which case the output is 0, since there can be no negative redstone output.
If this seems overwhelming, and you want to get it put in simple terms by a pro; watch this playlist of 4 videos, they will help a lot to understand Redstone, and will help immensely with Comparators:
https://www.youtube.com/playlist?list=PL2Qvl4gaBge1kABr3aBCrMSb94HFLIjbnHope this Helps
