The year 2072 isn't gratuitous (but is always misspelled in different countries releases), the Roman Coliseum was built in the year 72 A.D. therefore the main event is part of the bi-millennial celebrations.
The original title of the movie is "I Guerrieri Dell' Anno 2072", but the date changes a lot according to some countries. In the UK, the title is "Rome 2033 - The Fighter Centurions", and even the first Italian VHS pushed the date a little later - it was re-named "I Guerrieri Dell' Anno 2079".
An alternative title for this movie is "Rome, 2072 A.D. The New Gladiators" it was released in 1984 and is 104 minutes long.
In English, "I guerrieri dell'anno 2072" translates to "Warriors of the Year 2072".