Revolution Software explain on their Broken Sword 5 Kickstarter page what $1,000,000 will achieve:
$1M Bonus Stretch - Greenlight 'Beneath a Steel Sky 2'
"So where can we take you after fulfilling our ambition? For many years we have wanted to write a sequel to our 1994 classic adventure. If we reach this goal we will start work on this exciting, much-demanded project, and implement Easter eggs in Broken Sword: the Serpent's Curse, offering a glimpse of this futuristic dystopia."