We should either base our next release on linux kernel 2.6.30 or 2.6.31. Now we 
have to figure out what's our upgrade path with regards to squashfs with lzma 
support.

AFAICS the openwrt developers have squashfs-lzma patches against 2.6.30:

  https://dev.openwrt.org/browser/trunk/target/linux/generic-2.6/patches-2.6.30

We should check out whether they work for us as well and what we have to do 
with squashfs-tools.