Has it been decided what the default filesystem for Ubuntu 16.04 LTS will be? Will it still be ext4?
ext4 is great, but it was already great in ancient Ubuntu 9.10. Ironically, Wikipedia states
In 2008, the principal developer of the ext3 and ext4 file systems, Theodore Ts'o, stated that although ext4 has improved features, it is not a major advance, it uses old technology, and is a stop-gap.
It would be nice to get a few new features (ext5?) ... like built-in checksums to help detect and reduce bitrot (perhaps with file-by-file compression).
btrfs seems to continue to be around the corner but suffers from narrow adoption; and although Ubuntu has just announced zfs support, I don't think it is targeted to become the default.