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Effective 5/15/16 there are further changes. The main changes seem to be extending extended warranty coverage from 12 to 24 months, extending return protection coverage from 60 to 90 days, and extending Citi Price Rewind limits from $300/item and $1200/year to $500/item and $2500/year. Please update this wiki if you find other changes or find that any of these do not apply to certain cards.

Following are the benefits guides we have found:
Citi Thankyou Preferred, Forward card (and likely some others without annual fees)
Citi AT&T card
Citi ?? Non-cobranded card (likely cards without annual fees)
Citi ClickCiti AAdvantage and likely (but unconfirmed) AAdvantage Bronze card
Citi Hilton card
Citi Expedia+ card
Citi Thankyou Premier card
Citi AAdvantage Platinum, Gold and likely (but unconfirmed) Silver card
Citi Hilton Reserve card
Citi Expedia+ Voyager card
Citi Prestige card
Citi AAdvantage Executive
Citi Chairman Card



For historical purposes, here are the benefits guides we found that were effective 11/23/14 to 5/14/16:
Citi ?? Non-cobranded card
Citi AT&T card
Citi ?? Non-cobranded card
Citi Platinum, Gold and likely (but unconfirmed) Silver AAdvantage card
Citi Hilton (Reserve?) card
Citi ClickCiti and likely (but unconfirmed) Bronze AAdvantage card
Citi Hilton card
Citi ?? Non-cobranded card
Citi Executive AAdvantage card
Citi Prestige card
Citi Chairman Amex