1. Are you infringing the magazine's trademark? In your case, no, because you are using it for editorial purposes (as we explained in this post).
2. If there is a person on the cover, are you violating that person's right of publicity? Not based on your use (give thanks to Joe Namath).
3. Are you violating the magazine's copyright by reproducing the cover without permission? Yes, reproduction without permission is infringement. However, you're likely to be excused as a fair use because you're commenting on the magazine and especially if the reproduction is a reduced or thumbnail size (as we discussed in a previous entry).
P.S. Considering the popular definition for "quick question," perhaps we should all reconsider its future use.