rm -r fs/ext3 [LWN.net]
It's interesting that they are removing ext3 code but not ext2 (and frankly, I can see more new uses for ext2 than ext3, at the moment)
A few eyebrows went up when Jan Kara posted a patch removing the ext3 filesystem recently. Some users clearly thought the move represented a forced upgrade to ext4; Randy Dunlap remarked that "this looks like an April 1 joke to me." In truth, it is neither a joke nor a forced upgrade; it is, however, an interesting story to look back at.
It's interesting that they are removing ext3 code but not ext2 (and frankly, I can see more new uses for ext2 than ext3, at the moment)