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I think that languagehacker is referring to the color change when you click on it (to show you shared the post, or upvoted the comment).
The wheel is a ranged score. It's a rough gauge of how many users shared the post, or upvoted the comment. Currently, circles are added one-for-one. However, as the user base just took a jump, that might change soon. Although the circles all fill in after 8 clicks at the moment, there is no max. The range will probably be adjusted in the next update. -It's a good point that this could be made more clear in the FAQ page. Thanks.