It will probably not be known until a DSi exclusive game is released. The best done so far is being able to hack a savegame exploit in the early DS/i hybrid carts. Not much else can be said as I understand.
doesnt the new akaio update have one particular feature where if your using a DSi it will automaticly detect it to disable the gba icon? if its true then there is a high probability that it is posible to run acekard2i in DSi. unless its hardware that causes games to be loaded as DSi games.
im not a master mind at hacking but hopefully theres a ray of hope in my theory.