I didn't read all of your posts to know what you are thinking, but I, TheReal, have some words to say to you, about the new legendaries and black/white.
First of all, these games will be a lot about exploration: ruins, talismans, mythological creatures, etc. We will have evo's of old pokémons to myth creatures, like tauros to a minotauros and heracross to an Atlas based pokémon (Atlas is the guy that holds the world in his arms, which needs a lot of strengh, which combines with heracross fight type). Also, we will have that sarcophagus pokémon and others representing the temathic. But this is only an introduction to talk about the most important part... the legendaries!
The new trio will be based on egyptian mythology. They will be all dogs, but really dogs! Not like suicune, entei and raikou that some say they're dogs and other cats and others whatever come to their mind (like goats.. see post above me). This time will be really dogs! An Anubis like will be one of them and the others I can't figure out which of one are they, since we have some egyptian gods dog like. Their meaning won't be the same as the egyptian gods, of course, since most of them represent death and the underworld, temathics not apropriated to Pokémon. They'll have another symbolic meaning.
Now, the principal trio, from which we already know two. Reshiram and Zekrom represent the ying-yang: right! They're the opposite: right! They represent an opposition, artificial and natural life: right again! And it's all. Since we don't have another element in the ying-yang, the third legendary will be out of it. He will be just like Giratina, represents another 'world' (like Giratina represents the distortion world). This time, the ancient world will be represented, the beginning world when pokémon were created by Arceus, where the first Pokémon species habited. He will be a snake like pokémon with a turbine on his tail, just like Reshiram and Zekrom. Also Dragon type. Yes, Arceus won't be topped. He'll never be topped anyways.
That's all TheReal have to say to you. This is true story and for the most skeptics, just wait more two months and see!
(And this is why my signature makes sense, TheReal is God, yes, I'm God and I know everything, because on July Arceus is on vacation, just like may other people.)