I can confirm that they only replace the locks and keys now if your suffering bent keys due to stiff locks. Mine are on order at the local shop.

One side effect is that it appears that the original key blanks are no longer available with yamaha and dont seem to be in ready supply at local locksmiths. So if you lose a made of cheese key and simply want to replace it, your likely to require new locks as well as the blanks.
The new spec keys have the same groove profile (if thats what locksmiths call it) but have a thicker shank (?) and thus wont fit into the original locks designed for the slimmer keys.
My advice is if you think yours are ok but have the long slim keys, get them swapped now as you could be caught short trying to get new keys cut at future date.