I'm hoping the next Sony reader will have a built in light; I have my T1 in the official lighted cover I got on clearance a year ago, I find myself using the light during the day not just at night. I'd really like my next reader to have a built-in light, I hate it when the battery in the light starts to peter out and I can't get up to get a fresh battery because I've got a cat or three on/next/surrounding me!
I do keep the Nook ST I got as a gift charged and it's library updated in case something goes wrong with my T1 but I rarely use it; I really have a hankering to get a new reader, I'm hoping to see the Kobo Aura in person at an independent bookstore in the San Diego area sometime between now and when the new Sony appears.