Like Ubergine said, TU27 was primarily a bug fix. Its not unprecedented for 4J to rush a small patch to fix issues that affect the game in some major way. Adding the wood types to creative mode was a nice bonus. I would just venture a guess and say that the saplings weren't added because the growth algorithm hadn't been programmed yet at the time.
Quite frankly I think it's pathetic that so many people expect every patch update to contain copious amounts of new features. They can't just be happy with the inch, they need to take the mile.
The reason there's not a lot is because it's a teaser update. We now know about acacia wood and dark wood so that means we will be getting the biomes update so it may not be impressive but 4j does have a plan
A new TU is out too, along with the Star Wars Rebels skin pack being now available for PS platforms, looks like it's just a bug fix for now. Doesn't look like a letdown to me, let's just leave 4J working their best to give us the full 1.7.2 update or who knows add 1.8 completely too, like happened back in TU19. Patience is all I have.
More than Alex skins. Google MineCraft version history and read the wiki.
They've added features piecemeal from the beginning, but its generally the most obvious feature - biome code - that has everyone saying "console is at PC version X".
This also may look nitpicky and useless in a way, but looks like another block had its textures changed with this update, much like what happened with the rose (currently a poppy). Go check the sponge block in the creative menu.