The update, arriving tonight, will help improve usage of some applications.
Not much else is known about the update outside of that small detail, which was offered in a recent PlayStation tweet.
Heads-up: PS4 system software update v2.03 arrives later tonight, and will help improve usage of some applications.
— PlayStation (@PlayStation) December 3, 2014
The update to version 2.0 caused problems for many PlayStation 4 users, including unresponsive systems and errors connecting to YouTube. The issues were not universal, through Sony did acknowledge them and said it was looking into the issues at the time.