Since BBM went cross platform I'm sure the amount of people using Google Talk has shrunk. However if you are a user, you'll want to pick up the latest BlackBerry 10 update which adds BlackBerry 10.2 support.
Although the amount of new changes are not huge, it's great to see the dark theme introduced to save some battery life. With the dark theme already available for BBM, contacts and calendar lets hope BlackBerry continue this trend for their native applications.
New features in version 10.2.0.38: