As of Open Beta Update 4, the first implementation of horse riding is available for testing. You can summon/dismiss a horse while outside by pressing the "horse" button on the Action Bar.
Controlling your horse is much like driving a carriage. Please see the article on driving a carriage: https://3turnproductionshelp.zendesk.com/hc/en-us/articles/236108988-How-to-use-a-Carriage
Currently Known Issues:
- Rider is using incorrectly seated position
- Horse cannot currently jump
- Horse can be summoned in some buildings / should disappear when entering a building
- Some hills prove a challenge and we will continue to iterate on the collision and movement