Only for recent phones...
As the article rightly says, Jelly Beans or older phones in general (3 years or so?) will probably see no updates whatsoever. In case of Samsung, their response to my inquiry as to whether updates/patches will be provided for my S3 in light of the original Stagefright was: nope sorry, got to buy a more recent phone. So I did... but it sure wasn't a Samsung this time around.
It's just another carrier scam to force you into 2 year rip-off contracts as opposed to purchasing an unlocked phone and do whatever the hell you want with it.
If I ever find the time and inclination to do so, I'll give CyanogenMod a spin on the S3.