I just attempted to create a CTA using Rules Horizon with a link to the SFDC Opportunity object, something we frequently do in Bionic Rules.  I was unable to select the Opportunity ID as an Attribute, the page just said No Data Available.  Then, when I ran the rule manually, I received and email it was successful, but no CTA was generated and the Execution History showed a Failure symbol with a red triangle.  It was impossible to find an actual failure or error message.  I hope these bugs will be fixed prior to GA.  Let me know if I should create a ticket for Support, I am never sure when a feature is still in Beta.  Thanks!