When building boost 1.40  the libraries produced don't include compiler version or boost version any more ?

i.e boost 1.38
   bjam --build-dir=./tmpBuildDir  toolset=gcc stage link=static --with-date_time
        libboost_date_time-gcc42-mt.a -> libboost_date_time-gcc42-mt-1_38.a


 with boost 1.40 beta
     bjam --build-dir=./tmpBuildDir  toolset=gcc stage link=static --with-date_time
          libboost_date_time.a

  Is this expected  or a bug ?

  Best regards,
Ta,
   Avi