There are no revisions. I think its a lot of wishful thinking by people combined with false statements made by employees at the Apple Store. It only makes there life easier if they can say, 'Yeah the latest MBP's have revised motherboards'.
The Dailytech article was based on hearsay by some employees at the Apple store. Additionally people who have access to the internal Apple technical database used for repairs indicate that there are no technical notes regarding motherboard revisions.