WI means "When Issued" e.g. Kinder Morgan announces that on a certain date trading will begin on a listed stock exchange under the symbol KMI, until that date information (usually pricing) will appear under KMI-WI.
I do not know what WT means, perhaps "When Trading"???
WT is warrant. Back in May, KMI issues warrants to help finance the el paso deal. They will expire in May of 2017 with option to purchase a share of KMI for $40. Check them out - intruiging investment I believe. Currently at about $3.70 each.