I do not want to upgrade via Windows Update. I want a clean and fresh copy of Windows on my computer. Will I be able to download Windows 10, burn it to an DVD or make a bootable flash drive and use it to install Windows 10? Otherwise, I will just wait for it to be released and buy the OEM.
No, it would be nonsensical. It will be the same process as we had with previous Windows releases: Download ISO > make bootable DVD or USB > Install.
The first install needs to be an upgrade to verify eligibility. Further installs on the same hardware can be clean.
On one of the tweet in GabeAul Twitter he talked about that. On the end of the day, we'll 'see' how that would work in reality!