The penicillin example is commonly bandied about here. I'm sure it will continue unabated.
It's already known that antibiotic resistance is shared between bacteria on plasmids. It's also known that these plasmids have been around for a while. The news here is that the genes have been around for millions of years.
Somehow I find the concept unacceptable that bacteria know that when a human produced penicillin molecule hits them it is time to act.