Okay, for the past few months i have been trying to learn and remember the Dragon language that will feature in Skyrim, i have memorised the full Sons Of Skyrim song in english and the first half of it in Draconic, i dont want to learn the second half till i know how it goes and so far, it hasnt been released in any trailer or otherwiese sang, only the first half has. But when gameplay trailer was released a while back, we can hear a new part to the song after he shouts "Fus Ro Dah!" so i listned closely and read a text version of the second half of the song in Draconic and it does not match, which leaves me to wonder if there is actually 3 parts of this song, the first which has been sang but not written anywhere, the second which has been sang and written, and the last which has been written but not sang... i think this is correct anyhow, so... heres a link to the song, after "Fus Ro Dah" listen out for the singing in the background and see if you can connect it to the written song. Because i certainly cant.
Trailer: http://www.youtube.com/watch?v=PjqsYzBrP-M&feature=relmfu
You can find English and Draconic version of the song here: http://www.uesp.net/wiki/Lore:Dragon_Alphabet