FYI, as of this moment, still lagging behind in tlcontrib are the following binaries:
luatex.powerpc-linux luatex.x86_64-linux
Both updated in the meantime.
metapost.amd64-freebsd
luatex.win32 metapost.win32
I updated the two, but it's not (fully) automatic yet.
Also somewhat interesting: these texlive platforms are apparently not part of the context minimals at all:
alpha-linux mips-irix powerpc-aix
Very exotic ones.
i386-cygwin
There were attempts, but with no success ...
i386-netbsd sparc-linux (done by Karl Berry)
If anyone will miss them, there is no reason for not supporting them.
sparc-solaris
Pavneet is working on it (he has problems installing SVN on his server).
x86_64-solaris
I was only able to find i386 OpenSolaris (but then again ... the oper part of the platform is somehow being abandoned). Mojca