Only latest nvidia beta are compatible for X ABI 1.10. The driver package should take care of this.
I am not convinced that this is the best solution. Similar to bug 349356, I think the drivers themselves should depend on the version of the X server which they are compatible with.
*** This bug has been marked as a duplicate of bug 349356 ***
Reopen, as this is a different bug. CCing nvidia maintainers.
I had issues upgrading to new xorg because newer xorg-drivers did not require an update of xf86-input-evdev and other xf86-input-*
If the issue here is only the binary nvidia drivers, then the bug should be filed against nvidia-drivers and its maintainers will be contacted. If the issue is to make sure open source drivers gets rebuild when the xorg server ABI changes (ie, when upgrading from xorg-server 1.9 to 1.10) then there's currently nothing we can do about it. Portage lacks the necessary infrastructure. The best we can do (and we already do) is to print out a one-liner to rebuild X drivers in one scoop. Thanks for your understanding.