A new Eurostar terminal has been opened at the Gare Lille Europe last Thursday
http://www.lavoixdunord.fr/region/e...inal-transmanche-a-lille-europe-ia0b0n2843848
The article is in French, but the most relevant points are:-
Capacity has been doubled, and the new terminal can cope with 550 passengers per hour.
The total area has increased from 600 to 720 square metres.
The number of border posts (UK and France) plus security scanners has been doubled.
There is a new waiting room, with a Point Relais, which is a newsagents shop similar to WH Smith in the UK.
I am going on a day trip to Lille on Saturday, so I will post back here after I come back.
Regarding the journey from Marseille to London, on point worth noting is that the return service doesn't leave Marseille until after 3pm, because it has to wait for the train to come all the way from London. It would therefore be subject to delays, and it would have to be cleaned and serviced on arrival at Marseille.
There are direct trains from Marseille to Lille Europe at 06:44, 07:14, 09:14 and 12:11 which will probably be more convenient for people travelling back to the UK, especially if their final destination is beyond London.
You still have to change at Lille, but at least you don't have to do it at the same time as several hundred other people, and if you are on a through ticket you will have the CIV protection if the French TGV is late.