Less than a week before Dragonflight launch, the first encrypted Patch 10.0.5 was pushed to Blizzard CDN.

Patch number suggests a minor update between 10.0.2 (the current live version of the game) and 10.1 (the first major content patch of the expansion). The patch will likely be available for playtesting a few weeks after Dragonflight launches. 

Blizzard has disabled the Mage Tower since the pre-patch launched, and we’ve also seen some unexpected issues affecting Season 1 Rated PvP rewards. Maybe the 10.0.5 update will fix them.