A simple, unprompted "Hey everyone, haven't forgotten about you, still working on it... SORRY FOR THE DELAY" would constitute an update. We're not begging for proprietary info, just some courtesy.
It seems to me that unless the answer is "no", "no time frame" or "we're working with Sony to see what's possible, we're not going to be getting much more out of Pete Hines (apart from the occasional spat with someone who insults him - which he should really just ignore, since he's ignoring the bulk of our courteous, topical questions, anyway).
It's my opinion that nothing will be resolved until the next DLC is announced, at the earliest. Being the first non-"timed exclusive" release, Bethesda will have no choice but to come clean about the PS3 situation if they are unable to release that across all platforms (even if it's their silence doing all of the talking). Whatever the outcome is with this next DLC turns out to be will give Bethesda an opportunity to "rectify" the situation (either "here's all 3 and we had to stay quiet because compatibility with this one was the problem", "here's number 3 and we can't get the first 2 to work with it" or "sorry PS3, we're done here."). I don't think we'll get anything concrete until then, apart form maybe a "Hearthfire on the PS3 Update" post on the Bethblog on or around 10/4.