I drive a 2008 Yaris for my commute and I think the 2008 looks better. I think the bold new Toyota styling is getting uglier. I'd rather take a beige anonymous Toyota.
One of my biggest beef on the 2008 is the noise level. It just plain howls on 407 concrete pavement. So I'm glad this has been addressed in the new Yaris.
With a manual and light chassis, that car is actually fun in the corner. The suspension has enough starch to make it responsive.
I wouldn't mind to have more power but that engine feels torque′y with the manual. Stick it into 3rd gear in the on ramp, it can surprise more powerful cars.
I average mid-40 mpgs in winter and high 40s in summer. With the OEM low rolling resistance tires, I've done 51-52 mpg for my commute in the first year.
I knew the drawbacks of this car before buying it. But I was looking for a basic, no frills and dependable commuting car. This car has been dead reliable and very little maintenance is required as well.
But you have to know what you are in for and accept the flaws before choosing it.