Unfortunately, nobody knows the release schedule of VC titles. Just hope and pray like the rest of us that your favorite game will be released (and RBI baseball is a good one!)
It's perfectly safe to leave your Wii plugged in. In fact, I haven't unplugged mine since I bought it on the launch day about a year ago. As far as the blue light, if it's constantly glowing, that means you either have a message from Nintendo or a friend. Since you just got your's, it's probably from Nintendo.
Enjoy the Wii!