Ys Celeceta will be the deffinitive Ys 4. Forget about Dawn of Ys, or either of the Mask of the Sun games(currently, the SNES Mask of the Sun is the official Ys 4). Since there's never been an Ys 4 by Falcom themselves(Dawn of Ys by Hudson, Mask of the Sun by Tonkin' House, & Mask of the Sun: A New Theory by Taito), it's hard to know how close any elements of the story or characters will be to any of the old incarnations of Ys 4. For instance, Arem is only in Dawn of Ys, however, I believe Falcom planned to have Arem in the Ys 4 anime they were shopping around for, based on the style of art used, as Gadis, Garuda, & Bami look like they're straight out of the PCE game. Since I don't have a Vita yet, I'll probably wait until the US version comes to buy it. Otherwise, I'd probably just go ahead & buy the Jp version & try to play thru it.
Also, yeah, Uncharted is supposed to be good, I love the Uncharted games, so, I'll be getting that. I still haven't gotten into the Resistence games, but, seeing as how the Vita game might be the last one for awhile, maybe I'll pick up the series & start playing thru them at my leisure.