One of the new extended Newcastle to Southampton services seems a little pointless too, the final extension of the day diverts via Laverstock so is only really a bonus to through passengers for Basingstoke, the following Piccadilly to Bournemouth service will arrive into Southampton before it!
They'll probably run it as a special, with free bacon sarnies for rare track fans doing the Laverstock curve...
Seriously, I suspect pax for Southampton could well stay on just for the hassle free journey, it isnt that late so any change they make will probably be onto a pretty full alternative...
Paul