In the United States, the end of Autumn is nearing and Winter is approaching, but there hasn't yet been any push to get Reiser4 into the mainline Linux kernel. What has happened? Well, we asked Shishkin. Before asking Linus to pull Reiser4 into the mainline Linux kernel, he first wants to publish a plug-in design document in a scholarly magazine in order to facilitate some independent expert review. After missing the deadline for FAST 2010, Shishkin is now hoping to publish this Reiser4 document for USENIX Annual 2010. This would be due in January, but their annual conference does not take place until June. After that, they can focus on finally getting this advanced Linux file-system into the mainline code-base.
It's possible we could possibly see Reiser4 in the mainline Linux kernel in H2'2010. Assuming this all works out and Shishkin and the other developers go for inclusion shortly thereafter, it would put Reiser4 on the block around the Linux 2.6.36 time-frame.