The company is also planning to begin transitioning its Macs over to M4 processors later this year, but Mac updates typically don’t arrive until about a month after the annual iPhone launch.

To that end, the company has ramped up testing of four new Mac models to ensure compatibility with third-party applications, according to developer test logs seen by Bloomberg News. That’s a key step prior to launching the new machines. The Macs that appeared are labelled with the identifiers “16,1,” “16,2,” “16,3” and “16,10.”

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They all represent models with base-level versions of the M4 chip. Three of the Macs have 10 total cores in their central processing units, or CPUs, while one low-end version includes eight total cores — a measure of performance. The versions with 10-core CPUs also have 10-core GPUs, or graphics engines. The model with an eight-core CPU, meanwhile, has an eight-core graphics engine. They all have either 16 or 32 gigabytes of memory.

The 10-core CPU has the same specifications as the M4 processor in the iPad Pro, including four high-performance parts and six cores focused on efficiency. But the fourth chip seen in the developer logs only includes eight total cores, split between four high-performance parts and four efficiency cores.