I really wish Samsung were a little more candid in replying to this question. There are many devices out there, such as the first WD Live TV boxes that did not have Netflix support, but the newer models do.
This is due to required copy protection hardware by Netflix. I have a PN50B650, and this is my understanding why we don't have Netflix (most people's primary concern). I believe they'd upgrade the '09 models if they could.
Sometimes, you get what you pay for at the time. If it wasn't advertised to have Netflix explicitly, then there's no reasonable expectation it will. I was hoping so, but it's really not that big of a deal. I needed a TV when the '09 models were here, and so I bought then. My PLASMA is amazing and can't say I have any regrets, their scaling chips are great and SD is now watchable again in the age of HD.
I'm fairly certain I'm correct in the reason behind no Netflix, and thus I will buy Samsung again. In '09 only the LG's had Netflix support, anyone who needed that functionality for sure should have bought one of those.