Looks like Minecraft's "Adventure" mode is pushed back to 1.8. 1.7 will have pistons and some bug fixes. The 11/11/11 release date also likely to be pushed back.
Back in the office, and some words on 1.7 and 1.8!: "After a few weeks out of the office (E3, then Italy, then F.3.A.R this weekend (great game!)),..."