Gameloft already stated a while ago that they weren't interested in Android either. The reasoning being that (and this could be an exaggeration): "We can sell 400 times the amount of software on an iPhone that we could on an Android."
You can bet they're applying that same logic to the Windows Phone. And who can blame them? The market space simply hasn't shown its potential yet. It's not hard to guess that the Windows Marketplace is not moving anywhere near the amount of software Apple's App Store is, nor Android's. And while porting a title would seem to cut down on development costs, it's not always that simple. Especially across various phones.
I'm disappointed in the lack of absolutely killer apps too, but I'm not holding my breath just yet... My personal guess is we won't see a deluge of greater titles until Nokia hits the market. Until then, there simply aren't enough phones on the market to warrant major development of a Windows game.
Until big developers take the platform seriously, our only hope, really, are indie developers who have a passing interest in the platform.