Ti Book almost obsolete?

According to AppleInsider Apple has set the minumum requirements for OS X 10.5 "Leopard" just one model below my trusty TiBook at 866 mhz. They also say that 10.6 will be intel only, which is not a surprise. Still, for a computer who is running the clock to its 5th birthday in a month, and still gets 3+ hours of charge on its original battery, thats not bad! I started on 10.1 after all.