I missed the 3e buzz period because I wasn't interested in RPGing at the time, so I can make no comparison. But I can try to compare it to how it worked with the 3.5 revision, at least how I felt at the time.
I have to say first that I am not bothered by the speed at which teasers are revealed. It's possible that announcing it almost 1 year before is a bit too much, but ok.
Howver, after the 1st announcement (which provided immediately a good bunch of info), IMHO there has been a few months of near-nothingness, where we only got vague info labelled with "it's supercool, but we can't tell you how". Now it's been already 1 month where we got better than that, so hopefully that lame period is over. They could have spared us of those months, but that's all.
When the 3.5 revision came out, the announcement was only a few months before, and IIRC we immediately got concrete previews (of course, because those revisions were already settled and not still under testing). It felt good to me, even if we only got limited info per month, because the overall tone in disclosing the info was serious and trustful, to me it felt like the designers of my favourite game were talking to me openly, without hiding something, without teasing me. It felt like a trustful friendly relationship between "us and them".
With 4e the initial tone was no so. It felt like been treated a bit like children, or "marketing targets". Of course we are indeed marketing target, but I prefer to be treated as an adult person. That more than everything will increase my trust in a company. But, as I said, hopefully such period is over and from now we're going to hear designers speak seriously, and as a matter of fact, I suspect they wanted this since the start, but were harassed by marketing department. Let's keep in mind that marketing doesn't care about what is being sold, they just want to sell it (in fact, marketing experts just move between totally different companies with ease); developers care about WHAT they develop, and only indirectly about how much it sells.