Following Andrew Morton's [interview] recent posting of 2.6.0-test4-mm2 [forum], Christian Axelsson asked, "Is there any work [being] done on getting reiser4 into mm? I havent tried it myself yet but I've heard of colliding code in [the] scheduler". Andrew replied that a merging effort hasn't been made, but that he'd be interested in making it happen in a month or two so long as the namesys developers were willing to commit to providing him with up-to-date patches. Hans Reiser offered:

"We would be happy to make that commitment, and happy to switch from creating snapshots every week to pushing to you and linking to you from our website. Several people have asked for this besides Christian."

In other words, it looks like -mm users will soon have easy access to the resier4 filesystem.