One day after its release at WWDC, Apple has already issued a software update for the MacBook Pro (Retina).
The update, which weighs in at mere 1.26MB, fixes an issue with the trackpad being intermittently unresponsive:
About MacBook Pro (Retina) Trackpad Update 1.0
This update addresses an issue where the trackpad may not respond consistently to user input, and is recommended for all MacBook Pro with Retina display notebooks.
The updater will install in the Applications/Utilities folder and will launch automatically. Follow the instructions to complete the process.
Your computer's power cord must be connected and plugged into a working power source when running the update.