Incorrect. The Model 3 site says "Autopilot Hardware."
It does not say enabled by default.
Model 3 | Tesla Motors
Most likely an option. The engineers on the drive videos said there'll be a metal roof, and a retractable roof (if I recall the wording correctly) as well.
Some people will take issue with 1, saying "Tesla has always been behind schedule before," but I prefer to be somewhat optimistic until proven otherwise. Tesla's been building up their factory capacity and making investments. They're trying to engineer for a simple no hassle build, unlike past projects.