[OT]Between GPL v3 and GPL v3+

I want write code under licence GPL v3. I am afraid licence "GPL v3 and above" because today is not this licences and I don't know its will be well protect. On the other hand version 4 will be even better than version 3.
what should I write?
  This program is free software, licensed under the terms of the GNU      
  General Public License as published by the Free Software Foundation,    
  version 3 of the License, today is not version 3 or any later version
  but is reserved to change to later version if it release
?

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