Windows 10 will be Microsoft’s first operating system that will be sold on USB sticks. Both the Home and Pro versions will have retail packages on which the OS is delivered on a flash drive. This is in addition to the more traditional distribution method of retail installation DVDs, which should be the same price.
Several Canadian online retailers revealed the existence of the USB versions of Windows 10 by posting them on their website. There are no separate drives for 32-bit and 64-bit versions of the OS which so users can pick one during installation.
Windows 10 will be officially released on the 29th of July and will be a free upgrade for Windows 7 and Windows 8.1 users for the first year after release.
(Note, 27 June 2015: this article has been updated since its original posting on 25 June. The prior version stated that Microsoft will use flash drives instead of DVDs. Both flash drives and DVDs will be shipped.)