I found out from the AFF forums:
http://www.australianfrequentflyer.com.au/community/citibank…
As of 1/11/15 Citibank has reduced the redemption rates for Singapore and Virgin frequent flyer points via all rewards cards without notice.
Old rate was 1.5 Citi points = 1 Krisflyer/Velocity point, and the new rate is 2 Citi points = 1 Krisflyer/Velocity points.
I was personally only 2500 Citi points away from my dream redemption to Krisflyer, and in the blink of an eye I now apparently have to spend another $30k through my Signature card to get back to the same place I was a few days ago. Not happy Jan.
There is lots of discussion on AFF about whether Citi was obliged to inform customers under its T&Cs, and plenty of angry people complaining to Citi with varying results.
If you're affected by this (and unhappy about it), please make sure to complain through official channels to Citi.
https://www.citibank.com.au/global_docs/kana/contactus_compl…
Thanks for posting this, wasnt aware.