There has been a small balance update to Heart of the Swarm, which you can see below.
Zerg
Overseer
- The Pneumatized Carapace upgrade now increases Overseer movement speed from 1.88 to 3.375 (previously 1.88 to 2.75.)
David Kim's explanation for the change can be seen in this forum post.
Source:
Battle.net - Heart of the Swarm Balance Update: August 28, 2013
