Here are some things I've noticed:
1. Hidden Idenities: Everybody has pretty much figured out that Takanuva is Takua. But two other things, called Pewku and Gukko, I've found interesting hidden identities for:
Pewku = Puku, the crab that Takua rides (which makes sense, since Takua rides the Pewku as well)
Gukko = Goko, from Goko-Kahu, the flying bird that Takua rides (though Jala rides it in 2003)
2. Toa Disapearance? GregF answered a question asking whether any of the Toa would die or not, and said: Not yet. Does that "Not Yet" mean one is to disapear (in the fairly distant future)?
3. Nuhvok Kal: In his desription, it stated that he single handedly defeated Tahu Nuva (comic 10) and an entire Bohrok swarm. Is that a spoiler for things to come?
4. Repetitive Rahkshi: I'm not insulting or critisizing Lego, but the Rahkshi look very similar to each other, and there is very little different. Like the Bohrok before them, aside from staff design and overall color, the Rahkshi all have the same build and shape. I do not dislike the Rahkshi, because of this; I love them! But I've notived, after close examinations of the pictures available, that the Rahkshi are basically the same (exept for their color and staffs).
I'll post more as I go, I had many more things to post that I forgot.