>
> Whatever we do, I beg that we don't make this the default behaviour of
> package-install. There are probably plenty of people (me included) who
> use it as way to ensure a package is installed (without worrying about
> most recent version).
>
> We can add a command `package-update', or add an extra optional argument
> (something like `update-if-installed').
>

+1
-- 

-- 
Kaushal Modi