Maybe this is clearer with a diagram:
                 (1.0.89)
                  1.2.0
                  1.3.0            1.3.1       ...
  ------------------+----------------+----------------> development
                     \          |
                      \         | cherry picking
                       \        V bug fixes only
                        -----------------+------> stable 1.2 series
                                       1.2.1
-- 
Richard Jones, Virtualization Group, Red Hat 
http://people.redhat.com/~rjones
libguestfs lets you edit virtual machines.  Supports shell scripting,
bindings from many languages.  
http://et.redhat.com/~rjones/libguestfs/
See what it can do: 
http://et.redhat.com/~rjones/libguestfs/recipes.html