I think markmail sees the list as jena-users@incubator still but I ran out of time to explore it.
mail-archives.apache.org/mod_mbox/ still has jena-users@i.a.o separate from users@j.a.o but I think that a monthly batch job will get run one or around the 2nd and join the archives together.
(this may be driven by a DOAP file we have yet to do - don't know) Andy