Thornir Alekeg
Albatross!
In most circumstances, threads and posts in support of 4e are based upon some kind of information we have been given. Based upon that information, people get enthusiastic about the changes that seem to be coming. Perhaps the final version will be different and people enthusiastic about the change will be disappointed, but if they are actually willing to disclose some information about a change, the chances are the final result will be something like it.
In contrast, many of the threads and posts that are worried about 4e that get the "we don't really know anything about 4E yet because they haven't published it so your point is invalid" argument are based upon inferring something, or from something not said. For example, people complaining about "Emerald Frost" and other fluff tradition names inferred that the final PHB will include those traditions in such a way that people will feel compelled to use them - "I wanted to have an Ice Wizard, I guess he'll have to be part of the Emerald Frost." In cases like this, the fact that we have not seen the final version of 4e can be used as an argument with more validity.
In contrast, many of the threads and posts that are worried about 4e that get the "we don't really know anything about 4E yet because they haven't published it so your point is invalid" argument are based upon inferring something, or from something not said. For example, people complaining about "Emerald Frost" and other fluff tradition names inferred that the final PHB will include those traditions in such a way that people will feel compelled to use them - "I wanted to have an Ice Wizard, I guess he'll have to be part of the Emerald Frost." In cases like this, the fact that we have not seen the final version of 4e can be used as an argument with more validity.