Is the Southampton station layout being changed or is it like-for-like?
Seems like for like from what I can see so far, (although that's not a huge amount), and from what I've heard elsewhere. Rules of the route only showed it as planned renewals, and once the renewals of the S&C are done they are updating the interlocking, again like for like - according to Modern Railways a while ago anyway.
It ought to be the convenient time to reinstate full signalling for platform 5, which is the only significant change I have found mentioned in the route plan.
Lastly, I noticed that the signals on the last gantry approaching from the west are now LED heads, not sure if that is part of the job or just a coincidence.