Yes, I’m excited for other calendar platforms. In the meantime, I did write about alternative ways to sync and copy your calendar to Google: https://riviantrackr.com/news/how-to-use-rivian-assistants-google-calendar-integration-if-you-dont-have-google-calendar/
It'll default to whatever music app is currently selected, you can also say "Hey Rivian, switch over to Apple Music and play music by AJR" and it'll switch over and play music from that artist.
I've asked and a "lite" version of Rivian Assistant is in the works that will include messaging. Unknown when that will launch but it won't require Connect+
No, these are all the Ascend interior. Black materials are the same as Ocean Coast and Slate Sky. There's no path from going from the Adventure to the Ascend interior directly. Both R2 interiors in discussion here are premium.
Not sure where they got that information but seeing as employees had to pay for every color (aside from Esker Silver) and wheel config, I imagine the white interior will be an additional cost.