There's been a balance update to Heart of the Swarm, with changes influenced by feedback from the recent Call to Action. The changes are as follows:
Terran
- Hellbat
- Attack damage decreased from 18 + 12 vs. light to 18.
- The Infernal Pre-Igniter upgrade now increases attack damage to 18 + 12 vs. light.
- Banshee
- Cloaking research cost decreased from 200/200 to 100/100.
You can see David Kim's reasoning for these changes here.
Sources:
Battle.net - Heart of the Swarm Balance Update: July 11, 2013
Battle.net Forums - Balance Patch this week
