The Buyer's Guide recommendations do not take into account rumors in any way. They are strictly a mathematical computation based on past releases. Those interested in rumors are welcome to click through to the recent rumors stories, which are included right next to the buyer's guide info.
They're two separate ways of looking at things, and you'll get the best picture by paying attention to both sides...rumors and history.
The Mac mini currently stands at 306 days since the last update, compared to an average of 356 days. That means we're 86% of the way to the average update interval, and that qualifies for "don't buy" status by our algorithm.
The MacBook Pro is 210 days into this cycle against an average of 267 days. So we're only 79% of the way to the average update interval. It should pass into "Don't Buy" status within the next few days.
There is definitely something funny with the MacBook Air, which is at 95% of its update interval but not yet showing as "don't buy". We'll look into that one.