Bad news for those planning to activate Windows 11 with a Windows 7 or 8/8.1 key: users noticed that the latest Windows 11 preview builds no longer allow activation with old license keys.
It's because of the TPM shit but there are ways to bypass that in the installer. There's not that much difference in the architecture of Windows 7 v.s Windows 11, and there is theoretically nothing stopping a Win7 machine from running Win11. It's all the same since Vista anyway. That was the last major architecture revamp.