Some non-member spouses are not being shown even though they are in a marriage record. After the current bug fix, my understanding is that all spouses listed in marriage records will be shown in the online directory.
I've looked for policy on including non-member spouses in printed directories and I have not found any official policy. Handbook 2 addresses including phone numbers and email addresses in the printed directory, but does not mention non-member entries.
http://lds.org/handbook/handbook-2-admi ... ng#21.1.15
Currently non-member spouses are intentionally included in the on-line directory if they are listed in a marriage record.
There may, or may not, be future features to adjust this visibility, but currently they are expected to be displayed online.
Note: the only visibility to the online directory is for members logged in from that stake. A non-member ldsaccount would not have access as they would not be associated with a unit.