It is confirmed that the latest iOS beta by Apple will break the evasion jail break. However it won’t be too long before a revised jail break will be produced.
But even it there is a gap, or even if the latest version of iOS can’t be jail broken, will people update their devices. If you think about it the latest iOS is really good. But with a jail broken device just adding a few tweaks makes the world of difference.
I for one would hold off updating my iOS software just to keep my tweaks. Would you?