This just in: Oral arguments for the challenge to the current two-thirds rule—Eyman's 1053, which voters passed in 2010—have been scheduled for September 25 in front of the Washington State Supreme Court.
Democratic state legislators including Seattle's Sen. David Frockt (D-46, N. Seattle) and Rep. Jamie Pedersen (D-43, Capitol) brought the case along with education groups arguing that the rule has undermined the state's ability to fund schools—something the Court recently ruled they had illegally failed to do.
In late May, King County Superior Court ruled that the two-thirds rule was unconstitutional because the constitution lays out which laws require supermajorities and it does not include raising taxes in that list.
Here's our courtroom coverage of the argument last March in front of the KC Superior Court.
The Supreme Court also refused to stay the KC ruling, which means the lower court ruling stands for now. And that means, even in 1185 passes and voters reaffirm 1053, the legislature will be operating under a simple majority rule until the Supreme Court says otherwise.