The expressions of interest from two parties (14/12/11) was when ZYL was 12c:
http://hotcopper.com.au/post_single.asp?fid=1&tid=1628323&msgid=9356284
At 12c again now, it's either a takeover, or a capital raising. Or nothing. :) 12c does seem a bit "stuck", and makes me wonder why.