The band are hosting a special online listening party and live chat with guitarist Phil Collen later today at 5pm BST.
The lavish, in concert package, which was originally due to launch last month, will be out on 29 May.
The hotly-anticipated concert film is set for release on 29 May.
The new in-concert film package is now set for release on 29 May.
Other high profile guests set to appear in the new series include Queen's Brian May and country star Tanya Tucker.
'London To Vegas' will be released in a variety of formats, including a deluxe box set which will include a 40-page hardback book.
Proving that they learned their craft in record time, Def Leppard’s early years saw the group quickly evolve beyond their NWOBHM roots.
Featuring the band's first two albums, 'On Through The Night' and 'High N' Dry', plus a host of rarities, the new box set is out tomorrow, 20 March.
Def Leppard have shared the live footage of Rocket from the London 02 show from their upcoming London To Vegas concert film. To see the footage, visit udiscovermusic.com
The new release features two spectacular concert films: 'Hysteria At The O2' and 'Hits Vegas, Live At Planet Hollywood.'
The new collection includes remastered editions of the band's first two albums, 'On Through The Night' and 'High N' Dry' along with a wealth of rarities.
During the upcoming summer, the band are due to head out on a summer stadium tour across North America with Motley Crue, Poison and Joan Jett.
Among othere things, the video includes footage of the band meeting fans, conducting radio and TV interviews and much more.
While specific dates and venues have yet to be announced, the three acts will perform at major venues around the country.
"We’re in no rush, because we want to do it like we did the last one - without pressure", the frontman says.