These features are standard:
• The 48 months is from the date the cardholder was credited with the previous bonus, not from the previous card opening date.
....
• Cardholder must have had a minimum of $10K credit on the CSP to be eligible to apply for the CSR.
...but this would be new:
• The new rule for changing over from CSP to CSR is: switch CSP to Freedom or Freedom Unlimited (to keep Ultimate Rewards points) and then wait "2 full billing cycles or 46 days for the previous card to completely close out [huh?] to apply for the CSR card."