In front of the building there is a memorial to General (and later President) Eisenhower who led the D Day invasion.
On the roof of the embassy you can see the distinctive eagle and the US flag. If you read through the wikipedia link they discuss building a new US embassy elsewhere. However, my friends in London said it is very unlikely that they will get this done and if they do the expatriate community will be upset because the embassy is well located right now and the planned location is a bit off the beaten track, from what I'm told. In addition, the money would have to be appropriated by Congress and this seems less likely with our massive budget deficits.
On the back of the statue of Eisenhower is a summary of his speech to the troops prior to D Day.
Order of the Day June 6, 1944
Soldiers, sailors and airmen of the Allied Expeditionary forces! You are about to embark upon the great crusade... the hopes and prayers of liberty-loving people everywhere march with you.