Worth mentioning that it seems that the USB-C OpenPGP app may support RSA 4096. I'd love to upgrade my yubikey ssh key from RSA 2048 -> 4096.

Currently my YubiKey Neo only supports RSA 2048 as it's a hardware limitation of the NXP A700x chip used inside.

[0] https://www.yubico.com/2015/02/big-debate-2048-4096-yubicos-...