Okay, so here is the whole down low that I've noticed.
In the preview, notice that the first image after the shimmering flashing text is to the back of Hoenheim's head, and a blonde headed boy (Edward's hair colour), with the classic "Elric eyes" and his hair is short.
Now what this means, is for discussion, but I'm pretty sure that a similar theory is going to be repeated. This might just be Alphonse's real body. If someone could take a screencap, it'd be appreciated. I don't have any programs to do so, but I'm still trying desperately to find a way. @_@
So, what are your opinions? Discuss freely! ^^