The Class P shares have a liquidation value (whether the liquidation is voluntary or involuntary) of $1000 plus any UNPAID but DECLARED dividends. Since there has not been a board of directors since the takeover there have been no dividends declared, so technically they are not due. But I would be loving it if we get $1000 per share. I bought in at around $75-80 hoping for a $300-500 per share payout. We are getting close to that. I am not sure what the class R shares are, but there are K preferred which have a face (or liquidation) value of $25 per share also. I bought in the P shares because they were selling for less than 40X the amount of the WAMKQ shares, so they are a better deal. Both the WAMPQ and the WAMKQ have equal priority so they will get paid out in equal percentages of face value. In other words, if the P's get $400 per share, the K's would get $10 per share (both 40% of face value).
The above is based on what I have read, so please research it for yourself before buying!