This question is an exact duplicate of:
My primary reason for hovering a tag is to learn more about the tag. But when you hover a tag, that isn't one of the options on the popup. It has a link to questions tagged with that tag (with very misleading text), and buttons for following the tag or ignoring it, but not for going to the tag wiki to learn more about it. Before the redesign, the popup had an "info" link which I used all the time.
Two things which I believe fit within one FR:
Change the text of the current link to questions tagged with that tag. The current text is "View tag" which is odd, since it takes you to a list of questions, not the tag wiki.
Add a link to the tag wiki.