From a personal perspective, I find it highly impressive that their dev team can get stuff pushed out that quickly. Please don't get me wrong in that respect. But what you and I think is cool and impressive matters very little in a highly competitive market.
And I think it's also important to note that I'm not talking about speed of feature releases. I'm talking about speed of general releases. New Chrome features often go from conception to stable release in 2-3 months because of the development structure in which they are released. I wouldn't at all be surprised if the IE team have worked out these canvas issues already, but they just haven't released it (which is why I mentioned that the last beta release was in September).
And I think it's also important to note that I'm not talking about speed of feature releases. I'm talking about speed of general releases. New Chrome features often go from conception to stable release in 2-3 months because of the development structure in which they are released. I wouldn't at all be surprised if the IE team have worked out these canvas issues already, but they just haven't released it (which is why I mentioned that the last beta release was in September).