This is Apple’s most important keynote in a few years, since it unveiled the iPhone 6 and 6 Plus and first previewed the Apple Watch in September 2014. Shrinking sales didn’t really hurt Apple — it has enough cash to outlast an ice age — but it made it look like post-Steve Jobs Apple hasn’t been innovative enough. This is Apple’s chance to show it can still make the best stuff, while also driving its sales growth streak.