R devel - Dec 2012 - R NEWS change related to .C/.Call/.External/.Fortran

The much-appreciated feed of changes to NEWS.Rd list this today [1]:

  2.15.2 UTILITIES

  ?R CMD check? now checks for ?.C()?, ?.Call()?, ?.External()? and
  ?.Fortran()? calls in other packages, and gives a warning on those found from
  R itself (which are not part of the API and change without notice: many will
  changed for R 3.0.0).

Could this be clarified/rewritten? I honestly cannot make out what it is
supposed to say, apart from inferring that use of the API via these functions
will be patrolled more strongly. 

Dirk


[1] http://developer.r-project.org/blosxom.cgi/R-devel/2012/12/13#n2012-12-13

-- 
Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com