The negotiations and drafts are in fact secret even from Congress at this point, and there's a movement underway to give "fast-track authority" to the president which would also remove the debate from the bill.

"Obama has asked Congress to pass so-called Trade Promotion Authority legislation that would prohibit congressional amendments before an up or down vote on the Trans-Pacific Partnership"

http://www.abqjournal.com/582278/news/nms-dems-oppose-trade-...