Re: software update icon in F20
note, the old gpk updater and the new Software/Shell updater work in fundamentally different ways: gpk runs an 'online update', i.e. it just updates everything while your system is running, while Software/Shell update stuff does 'offline updating' - it downloads available updates in the background and reboots to install them when ready (and you agree, of course).
I'd recommend picking one strategy and sticking with it, not mixing them. If you go with online updates you might want to poke about in dconf and disable as much of the 'offline update' stuff as you can, as it'll just take up bandwidth and space needlessly (probably not much, but a bit).