Screenshot by Lance Whitney/CNET

Surface Pro 2 buyers who preorder the 256GB or 512GB editions may not receive the tablet for another two months.

Set to launch on October 22, the new Surface 2 and Surface Pro 2 tablets have been up for preorders since September 24. The shipping times for certain models found at Microsoft's online store have fluctuated since then. The latest estimates indicate that the 64GB Surface Pro 2 will ship by October 21, while the 128GB version will ship by October 25.

But the 256GB and 512GB flavors both display a ship date of December 15, pointing to a shorter supply of those two models.

The Surface 2, meanwhile, is available in two capacities -- 32GB and 64GB, both of which are slated to ship by October 25.