Got this reply from Steve Windham Director of Local Programming at TWC on the Feedback Forum
We are rolling out HD local service in Xfinity systems nationwide. Massachusetts systems will have local weather in HD later in 2012.
If this turns out to be true, I like how they don't specify a clear timeframe. I know a few posts up it says "sometime over the summer" but I'm a little dubious of that, I want to believe what they're saying, but another part of me says I shouldn't. I'll just play the wait and see game for a little longer.
EDIT: Alex, I saw in your question you brought up about the bandwidth thing again, I'm thinking it had to be more to it besides that, we went all digital here 2 years ago, even before the IS2 began beta testing. I'm beginning to think they must of purposely planned to wait until all Comcast/Xfinity served areas went digital before working on launching any IS2s in their served markets.