I have a fair knowledge of the plans for the Olympic Games. There will be lots of additional flights, Luton will be rather busy in the lead up, during the games and then for a few days after the closing ceremony, as will all London airports.
Add into the equation the security of the games, the participants and visitors plus the 'lock down' of the FIR, then you have a rather interesting month from mid July until mid August.
No doubt an increase in security will be visible at Luton and elsewhere, so beware!