Actually, changing the escape pods doesn't make sense at all, at least from a construction perspective. The main changes so far have all been individual systems that could easily be swapped out (ie, new nacelles, new deflector), or slight changes to the overall design. Changing the escape pod design would require reworking the entire escape pod system, not to mention adapting every pod docking port to fit a different shaped pod. It'd be a major reconstruction of every pod area at best.
Unless there's some massive improvement to the new pods design, I don't think there's any reason to change the arrangement of them. Maybe retexture them to look updated, but don't change the shape/placement.