Looks like Visa has come out with something called the "Visa Multi-Currency Solution" with their latest rules, which seems similar to what MC offers. DCC is also prohibited with those cards:


Other DCC rules seem to have been extended to "ATM Acquirers" (vs. just regular stores), but of course, the preexisting rules aren't exactly followed all that well in some countries as it is. We'll see how that goes I guess.