Of course they are Up To No Good. Here's the cover for their new single Pussy:
Though the lyrics ("You've got a pussy / I've got a dick / So what's the problem? / Let's do it quick!") do rather suggest that it would have sounded better left in German.
But since when have Rammstein behaved like good boys and avoided controversy and offence? This performance got them arrested in the US.
I'm so excited to be seeing them live that I could just go .... VOOM!