What does "Great, I’ve already read about it." mean in English for Spanish?

In English for Spanish, "Great, I’ve already read about it." means:

Genial, ya he leído sobre ello.

Listen to "Great, I’ve already read about it.": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a phrase that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 3, Level 3, Scene 4