This is pure speculation at its best, I’m not saying Brink has any political message it wants to put across nor am I saying it doesn’t, but the first thing I thought after viewing the trailer and realising it was made by Splash Damage, was that this seems very similar to our current situation in the UK; immigrants/refugees (the Resistance) living in make-shift slums such as The Jungle Refugee Camp in Calais (Container City) while they attempt to make it across to overcrowded Britain (The Ark), usually being stopped and sent back on their journey over or being deported back to their country of origin if they do make it across the English Channel by the UK Border Agency (Ark Security, minus the use of guns...yet). 
 
Due to Splash Damage being a British games development company I’d really like to know where their inspirations from the game come from and if it was indeed this conundrum that the country finds itself in.

Britain? Well I don't think Britain could actually make a 'prototype utopian city' let alone house fifty thousand people in it. I'd say it's more of an American setting (seeing as Bethesda got their claws on it) and I don't believe this is in the near future. This game is probably on a completely different planet anyway and I don't see British society/community spiralling out of control into a revolution of massively ugly long-necked people any time soon.  

Also, Splash Damage probably got inspiration from the sea of games already like it, and the fact Bethesda is sitting in the 'big chair' it's going to be highly America-nised, seeing as 2K (then Gearbox eating everything) was part of Borderlands turning armor into armour...

It's a good point about it possibly being commentary on immigration.  I initially read it as class warfare being played out.  The haves (those on the Ark) vs. the have-nots (other dudes).