Warlocks should be happy with some announced changes that should make thier life easier. Some nice plans on how to handle pets in the future, as posted on the official forums today.

We intend to make a change so that Warlock pets will vanish when you mount and reappear when you dismount from flying mounts, regular mounts and even flight paths to help conserve the need to use soul shards to resummon.

This will most likely be in a future patch that we do however, we do not have a specific date as of yet. At current our testing is looking promising for this feature.