More analysis of the 2.6.29 kernel...
"If we are to believe the statements made by Linus Torvalds when presenting the seventh release candidate of 2.6.29, and assuming release candidates come weekly, it will be at least another week or two before Linux kernel 2.6.29 becomes available. The Kernel Log will, therefore, continue its report about the new features scheduled for 2.6.29 with what's new in terms of file systems.
"As already mentioned during the merge window of 2.6.29, the kernel developers have integrated the experimental Btrfs file system. This doesn't imply that Btrfs is now complete – it rather means that the kernel hackers intend to further develop and mature it within the Linux kernel framework as they did Ext4. Ext4 was integrated into Linux 2.6.19 in autumn 2006 and recently completed its main development phase in Linux 2.6.28." [Read more at The H Open]

