Summer 2013 doesn't look to have the same weight as Spring 2013, that's for sure. There are a few that I'm particularly excited for though. Kimi no Iru Machi is getting an adaptation, which is good because it's based on one of my favorite mangas. It probably won't get that far into the story though, which makes me sad. The Monogatari Series: Second Season looks to be a must-watch as well, since the anime adaptations of that series have never failed to disappoint, at least in my opinion. Silver Spoon is something I'm super excited about too.
Aside from those, I'll probably watch WataMote, Rozen Maiden, Inu to Hasami wa Tsukaiyou (I'm actually pretty excited for this one too), Kin-Iro Mosaic, High School DxD (because I watched the previous season), Senki Zesshou Symphogear (for the same reason), Tamayura ~futatose~ (also for the same reason), Free! (the name is dumb but the promos are too nice), Kami nomi zo Shiru Sekai 3 (because I watched it all ;;), Hyperdimension Neptunia, Servant x Service... Hell I'll probably give most of the Summer 2013 shows at least the 3 episode minimum before I start dropping. There's a lot of 'cute girls doing cute things' shows for the summer, but there could also be a lot of gems so we'll see.