Just noticed today that there is no longer a 1.3Ghz cpu option on Apple's Macbook page, at least here in the US. It is also left out of the tech specs page.
I think you need to look again!
Still there, at least in the US.
(It's an option, under Choose processor when you configure your Macbook for order.
And, also on the Tech Specs page, in the Processor section.
"Configurable to 1.3GHz dual-core Intel Core M processor (Turbo Boost up to 2.9GHz) with 4MB shared L3 cache."