There will be substantial American participation changes in the Paris Air Show this year because sequestration means no American military aircraft will participate. American defense contractors have either scaled back participation or will be no-shows. Northrop-Grumman will not attend. Lockheed-Martin will have a reduced presence, trimming physical presence by 50% and sending 25% fewer people to save estimated $1 million.
Boeing will likely announce new orders, but its defense unit is more interested in air shows in the U.K., Dubai and Singapore. Raytheon will be at Paris. The American aircraft/defense industry will, instead, concentrate on unmanned systems aircraft at Paris as drones are becoming popular with long-term U.S and NATO missions in Iraq and Afghanistan.
Russia is expected to show/fly its YAK-130 light attack jet, the Kamov KA-52 attack helicopter and the Sukhoi Su-35 fighter at Paris.
Some years ago France and the U.K. decided to cooperate by holding the Paris and the Farnborough Air Shows every other year instead of competing annually. I expect this is still the arrangement so next year should be Farnborough's turn.
Meanwhile, the American annual EAA AirVenture Air Show starting (officially) 29 July at Oshkosh remains the world's largest air show in attendance. (I write "officially" because my last attendance at OSH arrival two days early on Saturday and the EAA was ready for us then).