I've reviewed UPDATING and don't see anything in it that seems relevant to this problem. It looks like for the past several weeks that X has been broken in the repositories and that a pkg upgrade isn't able to upgrade xorg-server. Is this a known issue or more likely something local? Is there an official place to check for known issues in the pkg system and/or report them?
Code:
# pkg upgrade -n
Updating FreeBSD repository catalogue...
FreeBSD repository is up-to-date.
All repositories are up-to-date.
Checking for upgrades (794 candidates): 100%
Processing candidates (794 candidates): 100%
pkg: Cannot solve problem using SAT solver:
pkg: cannot find xorg-server in the request
pkg: cannot solve job using SAT solver