Apple officially killed its dabble into the ZFS filesystem (that's redundant like saying "PIN number" but I ain't care).
My hunch: They'll move from HFS+ to btrfs. What is btrfs? And, more importantly, how do you pronounce it?
1. It's a super cool new filesystem being developed under the GPL, primarily for Linux. Official wiki.
2. Like this: Butter Eff Ess. That's right, it's like budduh.
Please please please! I wanna run Mac OS X 10.7 "Lion" on btrfs. That would be kick ass. Rarrrrr.