Similar gaskets surround the volume buttons. Altogether, this seems to represent a move toward increased water/dust resistance, and therefore improved durability.
How did Apple do? Well iPhone warranty provider Squaretrade was able to dunk both the 6 and 6 Plus for 10 seconds without any real damage. While this is indeed nice to have, especially for those of us who like to take our iPhones with us to the pool, it is by no means a guarantee like Samsung and Sony have on some of their phones.
And then there is the toilet. If you are willing to go after your iPhone 6 within a few seconds, you might actually have a good chance at saving it.
The slightly amphibious nature of the iPhone 6 isn’t entirely new either. Previous iPhones have been able to go underwater for a few seconds (see iPhone 5c below) but as you can see buttons and features rapidly begin to fail.