In reply to Saqib Ali.

"If" is the better question, rather than "when".

The feature plugin team working on it aims for 2fa to be proposed for WordPress 4.5 (probably April release, but target date not set yet as far as I know).

For a feature plugin, the proposal needs to be approved by the core team, then merged into core. Proposals aren't due yet, so it isn't final. The proposal may or may not include FIDO (since it is only limited to Chrome at this time, even though FF/Edge support is incoming), and may or may not include any particular 2fa method.

In short, still too far out to say that it will be included in Core. That said, the feature plugin works now (though with the warning it is under development, so use at your own risk) and is setup to be extendible. Even if it doesn't land in Core, it would be trivial to release support for FIDO (as it exists now in the feature plugin) as a plugin to work with the 2fa base to be proposed in 4.5.

In short, April is the earliest I'd expect it, but don't bank on it at this time.