Yes, we're well past API freeze. That said...
Tonight I was futzing around with Symfony because what else are you going to do when you have insomnia? I discovered that all of the examples from the "official" Symfony docs for the routing component use "path" and not "pattern" when defining the URL of the route, and so it's going to look like some weird Drupalism that we use "pattern" there (even though I realize this was the old standard in Symfony 2.1 and below).
We could keep this backwards compatible by still allowing 'pattern', but I feel strongly we should switch the defaults in core anyway to match Symfony's docs to help eliminate newbie confusion. What say you?
PASSED: [[SimpleTest]]: [MySQL] 59,099 pass(es).
PASSED: [[SimpleTest]]: [MySQL] 59,299 pass(es).
FAILED: [[SimpleTest]]: [MySQL] 59,138 pass(es), 2 fail(s), and 1 exception(s).