Citi has changed the restriction for sign-up bonuses on all the applications.
Previously it limited new credit card sign-up bonuses to one in 24 months for each family of cards. So you could only get one American Airlines credit card bonus every two years for example.
While that language is still in the application page, there’s new language on the terms of the applications regarding the sign-up bonus:
THIS OFFER IS VALID FOR NEW ACCOUNTS ONLY.
I checked a few cards and all applications has the same language on them, so I doubt this was changed by mistake. I believe the terms stated the same 24 month restrictions previously.
Conclusion
The new language is very vague and it’s not clear what they mean by “new”. But we’ve rarely seen any bank getting more lenient on churners lately so I’m assuming this is more like Amex’s once per lifetime rule, than any new account. We should get a better understanding soon.
HT: Out and Out

