It makes sense to me. The Wikimedia foundation greatly enriches the quality of Google's search results for the majority of users. I almost always want the Wikipedia article when I search for something.
The formal announcement is actually semi-officially available already: <a href="http://lists.wikimedia.org/pipermail/foundation-l/2010-February/056841.html" rel="nofollow">http://lists.wikimedia.org/pipermail/foundation-l/2010-Febru...</a>