First of all, the wiki has been updated. You can found it here, and it's quite interesting because it has a lot of recipes.
Ok, so I've been playing for some hours in a newly generated map, and these are my conclussions (I also checked some of the new stuff in a testing map using TooManyItems):
Map Seed: Industrialcraft2
Coordinates: 19, 85, -183
Time played: around five or six hours.
Mods used: Industrialcraft2, Buildcraft 2, RedPower (with all "addons"), Mo' Creatures, and some more that had no impact over the game, because I didn't use anything (in fact, from Buildcraft I still have to make something, but I can see oil around).
What I have now: some rubber trees plantation, a normal tree subterranean plantation, 11 solar panels, 2 batboxes (I'm only using one), an extractor, a macerator and two electric furnaces. And tons of cobblestone, of course XD. I also have more raw materials (inlcuding about 5 uranium ore), but it would be of small interest.
One of the first changes I noticed is that copper and tin ore are quicker to mine using the non-IC picks, and that you now need at least an iron pick to harvest the uranium ore. I also noticed in this map that, while I found lots of redstone in the lower levels, I found nearly no iron, and about minimun quantities of iron; coal, however, was nearly everywhere with in big veins.
Another thing I noticed (and I think it's a bug) is that the rubber trees grow insanely fast.
About my thoughts on the new ways the mod works, I'm happy to see the cabling is now more easy, setting solar plants is also more simple (no more need for the flowers!), and things look much more smooth. The only downside I found was that, coupled with Buildcraft's piping system, things work randomly regarding blocks inserted/extracted (no matter if you cannot put those items manually, with the pipes they will be put wherever there is free space).This means that a battery has to be put in the powering hole, and the item extraction might be something a little complicated. Hopefully this problem will be solved in the next release of Minecraft Forge, Buildcraft or Industrialcraft.
On monday I'll share with you all a new video about my Food Factory idea, with the new IC2 and BC2, so until then stay tuned and enjoy this small video about the new block of IC2 called "induction furnace" (it can take two blocks different or equal and process them quicker the longer it's burning).
Oh, and a good youtube channel with some videos about IC2 is this one, which has a lot of the new stuff showed up and explained. Enjoy!