NIST, the US Government standards body, recently went on the public record with an update about the Format Preserving Encryption standards track process. Great news! Lots of progress made and the final steps are in play.
Take a look here - https://csrc.nist.gov/groups/ST/toolkit/BCM/current_modes.html
The update is in the last section.
“NIST is developing a special publication to specify three modes for format preserving encryption based on the FFX framework: FFX-base, VAES3, and the analogous component of BPS. (See the FFX and BPS proposals on the modes development page.) A draft SP 800-38G is currently undergoing internal NIST review; a revised draft is expected to be released for public comment by the early spring”
So there we have it - as mentioned before, its moving ahead nicely.