Hybrid histograms in 11g ?

Hi listers,
I have just read the Oracle White paper:
http://www.oracle.com/technology/products/database/oracle11g/pdf/performance-11g-whitepaper.pdf

On page 11 there is a following statement:
"
...
ding better information to the CBO by correlating statistics, such as Number of 
Distinct Values (NDV) and histograms, on multiple column
...
"

Are these so called "Hybrid histograms" ?
If yes, is there still a constraint of 254 buckets per histogram?
Any ideas, experiences from "early birds" in this list  ?

Best Regrads.
Milen

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