In /usr/X11R6/lib/ there should be a link: libXv.so -> libXv.so.1 This is required for several programs, such as xine.
That's intentional. The interface is not stable, so it shouldn't be a shared library yet (this is at the request of the XFree86 people....)
Yes, as Bill says, it is very much intentional. If xine requires shared libXv, then xine is broken. The xine people should be informed that their software is building against non-standard shared libraries. The shared libs are only present in rawhide now for backwards compatibility with previous binaries. They are *not* there to be linked against by new applications.