"is still on the table" = ?

What does "is still on the table" mean?
Does it refers to "is still waiting for discussion"? Or does it mean "is still in the progress of disscusion"?

Context:

The fact that only two signatories were from the US hinted that most disenchantment lies elsewhere, he adds. "There does seem to be this bias against groups from the rest of the world."

Philip Campbell, editor-in-chief at Nature, says The EMBO Journal model "is still on the table", but says it's up to journal editors to decide if referees' demands for extra experiments are justified, and to spot referees who appear to be causing delays.

http://www.newscientist.com/article/dn18466-are-stem-cell-scientists-sabotaging-rivals-work.html