Although those themes are nice, I am a bit disappointed about the lack of ritual casting. I really expected one of the themes giving ritual casting out for free...
I really like the Ordained Priest. The encounter powers are good, whichever one you pick, and the +2 religion and insight makes me happy.
Scholar I'm not too terribly impressed with. But it does serve a niche that likes to know a lot of languages. The encounter power is a bit weird. You never have to use the power unless you hit a hard DC. So the fail condition seems to be a moot point. Also the bonus being Intelligence based makes it rather narrow in who can use the theme. We apparently can't have a scholarly cleric.
The Seer theme is conceptually pretty awesome. If there is an AoE attacker like a wizard or sorcerer in the party, I think I would target them this power more frequently than anyone else. Knowing that you can miss the fighter in the middle of a bunch of enemies is about as priceless as knowing when you're about to get a crit. Just hope you don't have to roll a saving throw when your 20 is up. Of course, when my 20 is up, I wouldn't mind making an intimidate check against a bloodied enemy either. though that's not likely to come up much since the 3 rolls will get used up quickly.
I would say ANYONE who is a scholar would have high INT. Who ever heard of a dumb scholar? OTOH even having a modest INT you'll still be pretty effective with the various bonuses. In a sense it IS narrow, but OTOH being a low WIS ordained priest isn't that great either, is it?