It's unclear whether the $10 subscription will let you watch an unlimited number of episodes from the site, and if advertising would still be displayed on the back catalogue episodes. The move to a subscription model isn't at all unexpected, but they'll probably have to offer something more than five-week old episodes for this to catch on. If you're able to stay on top of your favorite shows in a timely manner then you don't really need to sign up.
There are also rumors that Hulu might tie its subscription service with a new iPad application, but as Peter Kafka at MediaMemo notes their subscription aspirations could be significantly devalued by a free streaming video application from ABC already available on the App Store.
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