At first blush, this article seems to say that there's a solid hypothesis for which the math works consistently, and they know what they want to do in order to test that hypothesis. It's just a matter of designing and performing experiments.

But then, I read this:

[Co-author] Weller-Davies added: “A delicate interplay must exist if quantum particles such as atoms are able to bend classical spacetime. There must be a fundamental trade-off between the wave nature of atoms, and how large the random fluctuations in spacetime need to be.”

I know atoms aren't "particles," and I'm pretty damned sure they're also not quanta.