As you may or may not now, a new Pokemon has been announced to be coming soon. It is possibly the evolved version of Carbink as of the similar appearances, typing and description. The new update of Pokemon Online should include this Pokemon with the moveset from Carbink with it. IF you want to check the link for Diancie, here it is: http://www.pokemonxy.com/en-us/pokemon/diancie/ When Mega Latios and Latias, Volcanion and other legendaries are released, I am hoping in a later version of PO these are included.
Of course they'll be implemented, when we have a better idea of what they actually are, their movesets, etc. We aim for accuracy, so guessing that it's the evolution of Carbink without any hardcore proof, ie seeing it actually evolve, wouldn't do, so then there's no point in implementing it when we would be going off of an educated guess, a hunch if you will, since very little is actually confirmed.
Hi, we aren't going to add things to be used by the public until they are actually released. Playing the guessing game on what Diance's relationship is to carbink is pointless at the moment.