I've read that the show is all CG and also that
the show was Cel & CG together.  I haven't heard
any official word and I really don't think anyone
knows for sure what it is ;/

I got the patch when I bought my dvd's as well as
the blood bag.  I bought them when they were
released in the US though.  I have seen a couple
available on ebay.  My box doesn't say anything on
it, I think I remember the wrapping having some
sort of announcement of it though.  So if you are
buying used dvd's you might not know for sure if
you will get it or not (probably not since they
will most likely sell it seperately).

As for them releasing the sketches, sometimes it
takes years and years for anything to come out on
the market.  Who knows if they will release them
or not but usually after time some will slip through.