[racket] Functional Data Structures for Typed Racket?

I'm pretty keen to try out some of the new data
structures<http://www.ccs.neu.edu/scheme/pubs/sfp10-kth.pdf>for typed
Racket, but they haven't landed yet--either in 5.2.1, or in the
repo last I checked. Is there any notion of when I might be able to get my
hands on them?

-- 
Simon.
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