I imagine, once the game goes full, adding leagues will not be a problem. Considering the things you can edit with FM, EHM engine shouldn't be much different. Definetly should the coding of EHM: EA be a pleasure for all dedicated editors around this community, considering the wonders they were making with hardcoded EHM 07. At least I would imagine
Otherwise, back to topic, I will definetly start in Europe and considering the leagues available, it will either be Swedish leagues or KHL. Slovan Bratislava seems to be the first team that comes to my minds at the moment. Can't wait, it still feels so surreal, not only that EHM is back again, but that the actual game is already released (I expected a "coming soon" news at best today).