I’ve checked my Author Central page, and what do you know — I’ve got pages and pages of shiny, wonderful sales data. This appears to be pretty much the full Bookscan data for all of my books, not just the Amazon sales.
ETA: Amazon is providing a four-week window of sales data. Meaning you’ll be able to see how your books are doing over the past four weeks, but won’t be able to check back to see sales from six months ago.
They’re also providing more information about Amazon ranks tracked over time for your books.
If you need me, I’ll be having a datagasm…