Recent releases of libpng and libtiff have required a rebuild of all packages that depend on them; these have just been moved from [testing] to the main repos. As usual, remember to fully update your system and check your unofficial packages (especially the cairo-* packages from AUR) for required rebuilds.
The update might output messages similar to:
g_module_open() failed for /usr/lib/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-svg.so: libpng14.so.14: cannot open shared object file: No such file or directory
These can be safely ignored if you use our official cairo package; otherwise you may need to reinstall librsvg.