Google will rank better (higher) websites with mobile version!
So, here is my prediction for 2015: Google suggest a few times this year with no equivocation that the sites without mobile version are already qualified worse than siteswith mobile version (I say exactly this om all my clients from more than year). But for now it is only when you search from a mobile device and differences are very small, plus-minus one place. The truth is that on the one hand Google will certainly do so. Furthermore, the differences in the ranking will change with time, probably smooth. Which comes from the company's philosophy of - they know that the introduction of such a sudden change will hurt many websites and businesses and I am sure it will do it slowly and smoothly - this is the right way, and Google like to do things properly.
Official message on google blog is bottom:
More mobile-friendly websites in search results
Starting April 21, we will be expanding our use of mobile-friendliness as a ranking signal. This change will affect mobile searches in all languages worldwide and will have a significant impact in our search results.