https://wccftech.com/elden-ring-mount/

Elden Ring will feature only one type of mount, according to a reliable source.

Speaking on the ResetERA forums, Omnipotent, who is a well-known and reliable From Software insider, confirmed that there will only be one type of mount. As Elden Ring will be more open than the Souls game, but it won't be a big open-world game, this is not exactly surprising.