Well I have just emailed the ASX and asked them if the trades can be reversed. Since they usually take 48hrs to reply I wouldnt expect it to happen. I must say I do feel very sorry for the person who bought 400000 shares at 87c if it opens at 20c.... I think if the person feels they have been mislead due to the annoucement then maybe they could take legal action against the compnay? However i highly doubt we will see all trades reversed.