[ros-users] lookupVelocity not implemented in tf Python

I was just looking at the docs for the Python API to tf and noticed
the lookupVelocity function. However it seems (in boxturtle at least)
to not be implemented. There does look to be some source code but it
is commented out. Is this a feature that will return in a future
version? And are the Python tf API docs up to date, other than this
error?

Thanks,
Pat