you can be as high as you want when you play skyrim.
oh, sorry, did you mean how high you can set the graphics on your computer? for that as long as you meet minimum you will be able to launch it, after that you play around with settings to get the graphics to the level you're comfortable with. As said above, the game isn't out yet, so nobody can tell you what you can set
you'll be able to play that at High, most recommended Settings are for 1080P, so 720P is a lot lower resolution so you should be good to go.
Thanks for the reply's i guess ill wait for the game before i consider buying a 560ti