Google Invisible Recaptcha in 4.2?

[MMXII]

I was looking for an option to use Google's Invisible Recaptcha in 4.2, but apparently this is not possible (yet)? At least I haven't found such an option in the AdminCP. Can the Invisible Recaptcha already be used in 4.2, or am I correct that I have to wait until 4.3 is out?

[David..]

You have to wait until 4.3.