Here is an article I found on the BBC website. For those who are actually able to get to London (nice xchange rate ) and are planning on making the journey to The Continent via Paris, the station you leave from has changed.

Final call for Waterloo Eurostar

Eurostar services will now terminate at St Pancras
The last Eurostar train out of London Waterloo has left, almost exactly 13 years after the first.
From Wednesday St Pancras, recently refurbished at a cost of £800m, will become the new home of high-speed rail services to the continent.

Waterloo's award-winning terminal is expected to be used to take the burden off existing services to Surrey.

Here is the link for the full article:
http://news.bbc.co.uk/2/hi/uk_news/england/london/7092104.stm