There we a lot of pics from rehearsal. this is my contribution to the thread.
Photo report with all armored vehicles used in Victory Day Parade rehearsals. Several new vehicles were shown this year: KAMAZ-43269 Vistrel, TOS-1A and Pantsyr-S1. There are also the veterans: Willys MB, GAZ-67, T-34 and SU-100 for the first time.
To be honest, I think one of the primary goals of the military vehicle/technology addition to May 9th parades is to make common people aware of the modernization going on.
New stuff shown every year now
It's a number of factors. For one it's great marketing for Russian hardware. Also it's about military pride and showing off to the rest of the world, a kind of "dont mess with us" thing. Other part is tradition, except for the Yeltsin years the Parade has been a feature every year since 1945.
Just click on the picture. And the story is that they're already in the Indian ocean awaiting rendezvous with Moskva.Then they'll have some maneuvers and go on to Vladivostok for the city's 150'th anniversary and the Navy Day.