I saw some tag wiki suggestions for battlefield-4 in the review queue today. The game doesn't come out for several months and so has no valid questions until that time, so why do we need such a tag right now? Should tag wikis for upcoming games be rejected (if they're not coming out in a few days)?
We shouldn't have tags for games that we can't have questions about.
Fortunately, the system handles this for us, once the (off topic!) question on which the tag was used is suitably and swiftly deleted, the tag will be purged from the system within the next day.
If someone is foolish enough to try to submit a wiki for such a tag, feel free to reject it as not helpful or with a custom reject explaining that the tag is slated for deletion. It happens often enough.