His win percentage for 2012 so far (88.9%) is even higher than that of 2007, that is ridiculous. For comparison, it is also narrowly higher than Nadal's career best.
yes, only 7 losses so far, he has a chance to make another year with less than 10 losses, which would be the first time since 2007 (9 losses, always at least 12 losses each year since then).
Also already 3 MS1000 titles this year, holder of 4 MS1000 titles, it's the first time since 2006.
Yes, I'm really interested in the way he finishes the year, I read "let's not ask too much" but well let's take good things when they're there, he has a chance to finish this year greatly.
As NYCtennisfan said, no player has finished the year as number 1 after 30 years old since the ATP rankings were created, that's why it would be so tasty, especially 3 years after last time, tastier than whatever record Fed can achieve now.
But of course all this is less important than ... winning the US Open, which is indeed very possible, he looks very good and his opponents don't look great. He has interesting competitors but nothing impossible, that's why the period is very interesting for old Fed imo.