Uh... I have 6 words that describe my feelings right now.
WE CAN SUMMON OUR OWN DRAGON!?!?!? :mage:
Bet he won't be happy about it, but that was in the main article in the physical magazine, that you speak a word of command and force it to your side.
EDIT:@ Bryghtside: I mean I was right that Dragon Shouts were Thu'um in their older form, just like Dragonguards are to the Blades. Morrowind added to the scant information we had about the province, and it seems Skyrim will do the same.