The 10/mo is for unlimited back episodes of shows, once it launches (the app) people can still watch the last few episodes for free just as people do now on their computers.
Again, a $10 fee based on adding value to the already free Hulu service and people can't read or seem to understand what the fee is for. The list the items in the Plus package, access to ALL previous episodes of TV shows, as in every season, every show... HD streams, while not stated, I would guess 720p since 480p is already standard.
If you don't care about full seasons, past season or 720p streams, no reason to pay 10/month, if you enjoy watching past seasons or want to stream 720p you pay the fee to access it. Don't really see the issue, everyone still has a choice of paying or not. Freaking out because you either don't understand what the fee is about is just another example of lemmings making comments on crap they don't fully read the details about.
Hulu has stated up front, in very clear plain english how it works and what the fee is for.