The game boy micro, due to it´s size, doesn´t have the same port as the GBA and Nintendo has announced they´ll be launching a new series of accesories specially designed for the micro to communicate with regular GBA and SP ports.

First there is the wireless adapter wich will be able to “connect” with both regular wireles adapters for the gba and other gbm adapters. Next we have a regular link cable for the games that don´t use the wireless adapter, this cable can only link up two game boy micros, if you want to play multiplayer games with a GBA you will need a special adapter to plug into the regular GBA port.

This accesories have only been announced for Japan but i´m sure they´ll be launched worldwide. You can check out some pictures here.