The reason why we won’t see Windows 10 for phones available right off the bat is because Microsoft wants time to finish development of two new Lumia flagships. At least, that’s what it sounds like.

According to Unleash the Phones, Microsoft is working on two new high-end Lumia phones, one known as Cityman, and the other known as Talkman. The devices will allegedly be fairly similar, but vary in size—an approach we saw with Apple’s iPhone 6 and iPhone 6 Plus.

The Verge says Cityman is supposed to be Microsoft’s “true flagship,” and sport the kind of specs Android users are accustomed to. I’m talking a 5.7-inch QHD display, an octa-core Qualcomm processor, 3GB of RAM and a 20-megapixel camera. Additionally, the device is expected to come with a removable back—another staple of the Android market—giving users access to the battery and microSD slot.

Meanwhile, Microsoft’s Talkman will be very similar, with a 5.2-inch QHD display and Qualcomm hexa-core processor. Otherwise it’ll still include 3GB of RAM, and a 20-megapixel shooter; it isn’t immediately clear if this device will also sport a removable back like its bigger brother, but seeing as they’re so similar, it probably will.

Since these devices are being billed as big Microsoft flagships, they’re expected to support the company’s new Continuum feature, which needs specific hardware to work properly.

These reports don’t say when fans can expect Microsoft’s devices to come out, but since Windows 10 for phones is expected to launch after Windows 10 for PC this summer, perhaps we can anticipate a release sometime in the fall.