They have released two of the songs from the new album on the British and US version of their new Greatest Hits albums (Waterloo Sunset and No Matter What) and they are great songs. Also I saw them in concert oct. 24 '05 and they performed their version of David Essex's Rock on and did such a great job with it I can't wait for the album to be released!
And Def Leppard has released an UNofficial tracklist for the album which at the moment is scheduled to release Spring '06
01. Waterloo Sunset (Kinks)
02. 21st Century Boy (T-Rex)
03. Little Bit Of Love (Free)
04. Drive In Saturday (David Bowie)
05. Street Life (Roxy Music)
06. Hanging On The Telephone (Blondie)
07. The Golden Age Of Rock N Roll (Mott The Hoople)
08. Don't Believe A Word (Thin Lizzy)
09. Rock On (David Essex)
10. He's Gonna Step On You Again (aka Step On)(John Kongos, also covered by Happy Mondays & The Party Boys)
11. 10538 Overture (ELO)
12. Hellraiser (Sweet)
13. No Matter What (Badfinger)
14. Stay With Me (Faces)
Like I said totally unofficial, and they did record more songs like: Amaerican Girl by Tom Petty however I cannot find the list on their website, will update this when I find it.