The new tag popup makes it easy to watch or ignore particular tags and shows the tag info excerpt. Here's one on EL&U:
However, the full tag info contains a lot more information which helps users. Getting at that information is not obvious: you need to click the View tag link which provides a list of questions and an abbreviated excerpt, and then click the Learn more... link.
The old tag pop-up used to include a link to the full tag info, and it appears that this was implemented as a result of a request in 2011 which changed behaviour which was remarkably similar to what happens now.
Here's an example I found to give the idea. The Info link showed the full tag info.
The current behaviour is a regression, breaking something which was previously fixed.
Could View tag in the new popup be changed to Other questions and a new More info link be included which gives easier access to the full tag info? Perhaps something like this...