The reason Dishnet has been mum recently on possible 3D rollout dates is they have already passed their initial "possible" season for the rollout, they have been burned and, really due to no fault of their own, really upset a lot of people way back when HDTV first arrived by constantly pushing back the rollout date for HDTV.
To be honest, I was surprised they even mentioned 3D availability before they were absolutely certain about the initial broadcast date. I suppose they had to do something with "official statements" since Directv already started 3D broadcasts.
If the past is any indication, I doubt we will hear even a whisper of the 3D rollout until one day, like magic, we'll see several 3D channels available. My assumption is compatibility, software issues and the rest all will have few bugs as they will have done their homework to provide a smooth transition.
It has been my experience that Dishnet's customer service has been superior to Directv's. That's just my experience. I like their receivers better, I like their programming better and the way they keep bringing in new channels, I just like Dishnet better and expect their 3D programming to be superior to Directv's when it arrives.
My Dishnet installer told me he has been expecting the 3D channels to be up and running any day now but has thought so for the last few months.