That phrase has been expanded to "Bonus Tracks, Extended Plays, Dubs, Remixes.... and more to come! This page should help you keep them straight."
July 14 saw the arrival of the European version with one new track, and in addition we can now expect a Japanese SHD release on December 17.
No extra songs if this page on the Japanese HMV store is telling the truth, it is comparable to the European version with the bonus track Dark Horse Dub.
But the SHM (Super High Material) pressing might tempt a fans to buy this the latest incarnation of Circus Money.
More on what SHM is can be read in these discussion threads:
What is this new SHM-CD?
SHM-CD format: Hype Or Hope?
And a big thank you to Scott for the news alert!