Minecraft, 1.7, promises the addition of pistons (seriously!), thus allowing for the creation of mechanical objects. Rather than include it as planned in the 1.8 update alongside Adventure mode, creative lead Markus "Notch" Persson and partner Jens Bergentsen instead chose to drop it in with a handful of bug fixes in 1.7. No solid release date is given for 1.7 (or 1.8 for that matter), but the former will be released "soon" while the latter "might be a long wait."
Persson also notes that, after update 1.8 is released in the coming months (Adventure mode and all), the team at Mojang will "start crunching for the full release," though it seems that the official launch may not make its intended November 11 date. "The release date is almost certainly changed to sometime the week after 11/11/11, and we're working hard on setting that up," Persson explains. And following that, after years of laboring on Minecraft, Persson and Co. get some much needed vacation time. After that? "I'll start working on the first post-release update," he adds with a grinning emoticon.