How so?
Well, for starters there's the fact that clan size now affects your ability to initiate a siege, and actions against a rival clan city will require more members than actions against a hamlet (and trial accounts won't count towards your clan size). All attacking clans will also need to pay a wager, the amount of which is affected by several variables. First up is the target city's power level, which is derived from how many buildings are in evidence. Your clan's wager will also change according to how many clans are already sieging by the time you join.
These tweaks are the tip of the proverbial iceberg, and there's much more reading material at the official Darkfall Epic Blog.
