Creating confusion among developers just because you want to release "fancy HTML5 stuff" doesn't seem to me as a good idea.

Why not first implement these new features on your own browser as "developer version only", and prove that they work and do benefit users and the web in general? I believe that is the way you establish credibility and acceptance of a particular feature.

I am not against the release of all these amazing things, but I am against the way they are currently doing it.

If the proposed features do not have defined and W3C-agreed set of names and properties associated with those features, they should not be released to end users.

I don't want to see something like "only for IE" in applications and websites anymore. The problem is still small for now, but it can become huge if this bad practice doesn't stop.