Actually, PCI-E is PCI Express, found on the Mac Pro (it's a full size PCI style card). I do trust the labels, which is why I'm pointing out that you're dead wrong on the ports that I mentioned. The label on the one you're calling FireWire 800 is clearly the established display icon as found on all current Apple notebooks, and the FireWire icon is clearly visible (well, as clear as it can be considering the image) on the port you labeled as Mini-DVI.
jW
EDIT: Aaaand, to answer your edit, the power connection (MagSafe) is currently right next to the other ports (I'm typing on a MacBook right now, and I work on both MB's and MBP's all day long), and they will without a doubt continue to be, considering these pictures. I don't think there's a port on the top right of that image at all, simply a thicker area of the casing to support the weight of the display. There's a similar area, slightly differently shaped, on the left.
What I'm more interested in is the hole on the top left of that image. I can't think of any reason for that.