This likely means that Apple is preparing its back-end technology to handle the preorder payload.
Customers can now order the iPad Air 2 and iPad Mini 3 tablets, which will be released next week.
If accurate, that's double the number of iPhone 6 and iPhone 6 Plus units sold during launch weekend in the US and elsewhere.
The Moto 360 smartwatch, which sold out in a matter of hours last week, will also be available again, but in limited quantities.
Apple says it hit a record in the first day of sales. However, it confirms demand outstripped initial preorder supplies, so some customers will receive their new iPhones as late as October.
Advance orders began online at 12 a.m. PT on Friday, but the online Apple Store still wasn't back up two hours later. And some other preorder sites had hiccups, including Sprint and T-Mobile.
Despite online-store outages and other glitches, more customers have preordered Apple's two newest iPhones than ever before, the company says.
Online store apparently prepping for consumer demand for pair of new handsets, which feature larger screens than their predecessor.
Advanced purchases for the new, bigger-screen smartphones through Apple's digital store will begin at the exact moment around the globe and at the same time as the carriers -- 12 a.m. PT Friday.
All other new iPhones will pale in comparison to the Falcon luxury iPhone 6, a gold-plated beast with a massive rock attached to the back.