This is not the first time that they have significant updates days before a major announcement. I suspect that Apply keeps a lot of options for things to talk

This is not the first time that they have significant updates days before a major announcement. I suspect that Apply keeps a lot of options for things to talk about until the last days. They wait for every key aspect of the announcement to be confirmed (which can be days earlier). That allows them to focus on the expected change if they are ready, or, if there is a last-minute issue, they can talk about spec upgrades to fill the hour, or rather to ramp up the announcement (e.g. “With all that memory, HD videos are going to look _gorgeous_. And you know where you can find HD videos? Boom! New VOD service!”). It’s consistent with descriptions of how Steve Jobs would scrape large segments of his keynotes at the last minute.