If its in the app store, doesn't it mean Apple approved it, and I know they wouldn't approve a netflix app unless it was officially submitted by netflix.
Also, here's a list of 1350 ipad apps that are supposed to be in the app store on April 3rd:
http://appadvice.com/appcollections/view/ipad-apps
I looked through and netflix is there. So I'm leaning towards it being a real app. I don't know exactly how appadvice gets its info, but if it has access to a genuine listing of approved apps, it seems the netflix app is real.