Given they're regionalising it that's not so unlikely. At a minimum it'll be North and South, so drawing Millwall in the group stage would be a 1 in 8 chance. Other realistic option would be four regions for the groups (likely North, Midlands, South East and South West) which reduces it to 1 in 4.Could be great for 1882 away games, unless it's Millwall away as I'm a coward and don't want to encounter Harry The Dog on a cold, dark night in Bermondsey.
With just North and South odds of drawing a London team are marginally above 50%. With four regions it goes up to marginally above 80% (with some chance for multiple London sides).