The title is click bait, like other blogs that are posting about a possible September release. The content of the article is actually the useful part, you know

. This is one of the few articles I've seen that try to put the TechCrunch rumor in context with the prior rumors. My point is that just about all these rumors, no matter what release date they're talking about are just that: rumors. Bloggers are almost always posting as if these rumors are facts and generally provide no useful corroborating evidence or thoughtful analysis whenever they post about what some guy in his basement made up. This contributes to the sort of thing you're seeing-- it's that much harder for consumers to make purchasing decisions (probably more so than it would be without the lame blog posts).
I doubt we'll see a March release per se, but an announcement then, with release in Q2 is possible if you believe the Quantum chairman's slip up is real.
What makes me a little skeptical is that the last watchOS beta has no major/ useful features (how many people have more than one Apple Watch!). Usually, we get a big beta iOS update just before each new iPhone. I don't think we'll see a watchOS 3 beta in time for any March announcements, seeing as how the last update is still in beta form. The multi-watch pairing still might hint at an interesting March announcement of some sort, if Apple uses the multi- pairing feature in an unexpected way (I have no idea what that might be, myself).