Very true. How has it worked in the past? When were the Penryn chips released, and how long after until Apple had them in their machines?
Based on what I found in Google, the Penryn chips were released in November 2007 and the new Penryn MacBook Pros were released at the end of February in 2008. So, if the new Arrandale chips are released in January, they might not make it into the MacBook Pros until April.