Hi Francois,
> I am very interesting in the new features of the future
> NETCDF 4 and I was wondering if there's a target or tentative
> date for the release of this software?
An alpha release is available now from 
  ftp://ftp.unidata.ucar.edu/pub/netcdf/netcdf-4/
but a beta release needs features that will be implemented in HDF5
version 1.8.  I'm hoping we'll be able to package a netCDF-4 beta
release within a few weeks of on an HDF5 1.8 beta release, and we
expect that will be available early next year.  
As usual, unanticipated problems could cause delays.
--Russ
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