Rationale (August, 2010):

The current specification is as intended.

Historically, based on C's treatment, cv-qualification of non-class rvalues has been ignored in C++. With the advent of rvalue references, it's not quite as clear that this is desirable. For example, some implementations are reported to print const rvalue for the following program:

const int bar() {
   return 5;
}

void pass_int(int&& i) {
   printf("rvalue\n");
}

void pass_int(const int&& i) {
   printf("const rvalue\n");
}

int main() {
   pass_int(bar());
}