The P3 service is a big winner for those who can collect it, currently it's eight services to the UK, five at Felixstowe and three at Southampton, word is that's where they will stay for the foreseeable future, but both Ports may loose other services to ensure prime slots at the quay for P3. No one really knows what will shake out when the merry go round stops.
I can also confirm LGW have been seriously shaking the Southampton tree, being owned by the same parent company means little in this tug of war for custom. Like Tilbury, Southampton is 'part' owned and wild guesses are that if they can secure some of that traffic to LGW they may pull out of Southampton and consolidate at LGW which will be wholly owned.
Felixstowe have done a lot of PR recently with COSCO and CSCL, the Chinese being Chinese would obviously prefer to line there own pockets rather than the middle east, but business is business and will clearly go where the rates are cheapest.
Evergreen are feeling left in the wilderness and may team up with someone or possibly join the CKYH alliance, interesting times ahead.