The equinox might be weeks away, but not even the rules of astronomy can deter the relentless march of capitalism. On the corporate clock, autumn begins with the launch of chain restaurant fall menus. Up first is Tim Hortons, which unveiled a new "pumpkin spice" menu available as of August 29.Yup, we're not even waiting for September anymore.There will be two fall dream donuts this year: the Pumpkin Spice Dream Donut with orange and white fondant and candied praline pumpkin seeds; and the Creamy Maple Pecan Dream Donut with maple fondant, chocolate and praline pecans.