Probably never. We don't even have ext3 or ext4 support, only some bare ext2. And then there is the dozen or so other filesystems that would be handy to have. Microsoft doesn't care, they also don't have a business case for it, and they rather reinvent the wheel instead, using their own fs.

The FOSS community doesn't really care that much either, mostly because Linux can deal with NTFS, and the other way around happens far less, so no real push has been made for it.