These were the original options http://investorshub.advfn.com/boards/read_msg.aspx?message_id=117332241
And they remain the same according to the most recent filiing https://www.sec.gov/Archives/edgar/data/107263/000119312516601694/d80568ddefm14a.htm
For each share of WMB: You can exchange for....
$8.00 in cash and 1.5274 common shares representing limited partner interests in ETC (“ETC common shares”) (the “mixed consideration”); or
1.8716 ETC common shares (the “share consideration”); or
$43.50 in cash (the “cash consideration”). WMB stockholders that elect to receive the share consideration or the cash consideration will be subject to proration to ensure that the aggregate number of ETC common shares and the aggregate amount of cash paid in the merger will be the same as if all electing WMB shares received the mixed consideration.
The receipt of the merger consideration is expected to be tax-free to the WMB stockholders, except with respect to any cash received. In addition, WMB is entitled to declare a special, one-time dividend of $0.10 per share of WMB common stock, to be paid to holders of record immediately prior to the closing of the merger and contingent upon consummation of the merger.
I would have thought the cash consideration would have been changed all considering, but I guess not. Once set in stone, set in stone?