The PSP Elder Scrolls game that was cancelled had to be a spin-off. The PSP just didn't have hardware comparable to the PS3's, the 360's, or whatever else was required to handle Oblivion. This new Vita... it's supposedly very comparable to the PS3 and 360 and while the PS3 and 360 have the same, exact hardware they used to, the Vita is very much an upgrade from the PSP.
im just saying i would rather there be a new game using the skyrim hardware designed for the psvita, i know how strong it is, but how would SKYRIM take advantage of the touchpad/screen and the gyroscopic controlls. if it didnt use them it wouldnt be the end of the world, im just saying i would prefer a game built for the vita.