Primordial Gravity Waves

Q146: Before the end of 2016, will a reputable group of scientists announce that they have detected evidence of primordial gravity waves?
Yes: 20%
(This question is very similar to SciCast question 387)

Primordial gravitational waves are an expected consequence of some theories of (cosmological) inflation.  In 2014, researchers using the BICEP2 telescope claimed to have detected these waves, but their findings were later retracted due to evidence of intervening dust clouds responsible for the signal (see story here).  However, there still seem to be several teams attempting to find primordial gravity waves.

Scientific discovery often takes a long time, and I see no evidence that a new announcement is imminent.  I am thus going to go with a fairly low estimate.