Anyway that is the reason I delete the "or any later" term in my copyright
notices. Apart from the fact that one can never know whether gpl4 will give
all the rights exclusively to microsoft or google or the nsa...
I have always wondered about this, as it never made sense to me to license your work under something which doesn't exist yet, and you don't know what its terms will be! Will the GPL5 also give away rights to your organs along with the software? Probably not, but I'm not willing to risk it.
Jeremy