Well...haven't been on the forums in a while....anyway, Keapora Gaebora is the reincarnation of an ancient sage, so this sage would have to have pass away before he could take the form of the owl. So, it is probably safe to say he is definatly not Rauru. In terms of the "sage" in the SS trailer, this could perhaps be the Raura from Ocarina of Time or mearly an ancestor of some sort. Now, this could point out the fact that maybe 6 other sages existed in Skyloft before the formation of Hyrule...meaning any one of those six could be Keapora Gaebora. That point is definatly open for debate as we have no idea what the people of Skyloft's customs are...but if this sage theory is correct...maybe these "Skylians" follow the basis of the known "Hylian" culture. Interesting that those two culture names reflect each other so well...maybe a hint? Oh, it is also interesting to look at the owl from Majora's Mask. In this game, almost everyone except for Link, the Skull Kid and The Happy Mask Salesman have alternate personalities. Okay, so Keapora Gaebora knows who you are in Termina, he does the same "help Link on his quest" type stuff and acts the same. So did he go through the dimension gate to Termina as well? Or is this another owl altogether? Maybe Rauru or the ancient sage is influencing things? Unfortunatly this topic creates many new paths to follow and leaves many loose ends to tie up. But thats what we theorists love, right? Hope this helps in some way....if you find out any info or come up with any new ideas I would love to take a look! Cheers and good luck!