Just to be clear: I'm not a FH2 developer and I don't know how FH2 handles community factions, but I can imagine it being something like this:
Creating a new faction isn't an easy task. In fact, it's a hell of a job to make it actually good. The devs already have their hands full on FH2 alone, so if you want to see the FEB, I'd suggest you put a team together of people that are willing (and know how!) to mod. Then create/reskin soldiers, kits, weapons and vehicles.
You're also going to need voices. Something tells me Portugese voices already exist in the BF2 world somewhere, but I'm not sure.
And last but certainly not least: maps. Make sure you have at least two maps or so? Those maps need to be of good quality, otherwise they'll never make it to FH2.
If the faction isn't top notch quality, I'm pretty sure it won't make FH2. You'd have a better chance of the faction being incorporated into "CMP" or so.