I have been seeing a lot of posts by Fizzer about his work on the new Android app for WL, which I wholeheartedly support. However, is there already an iPhone app, or one on the way? I ask because I am American, and I know that the iPhone has a huge market share there. I think I could get a lot of my friends interested in WL if there was an iPhone app.

Yep. See http://wiki.warlight.net/index.php/Mobile_Client.

The only reason I'm focusing on Android first is because Apple doesn't really let people run betas very well. On Android, I can actually let people use it while I'm developing it. Apple customers will have to wait until it's polished enough for the app store, which will likely still be a while.

Cool. Will it be a free app, or paid? I know a lot of apps on the AppStore had two versions, a free one ("demo) and a paid one.