Not only has Google come out and supported a mobile strategy, it comes with specific SEO friendly recommendations at no extra cost. Google supports three ways of serving mobile specific content to users and have provided recommendations for each.
Watching the progression of mobile SEO has been more than interesting. When I think about important concepts for mobile, battery life and Internet speed play a huge role in conversion. So, it would make sense that the iPad dominates revenue across the board as most of these devices are connected to WiFi and used mainly for browsing.