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How accurately will GAIA measure the Hubble constant and will it be model dependent?

GAIA DR2 is due out in about a month.

Planck has measured the Hubble constant to be about 67-68km/s/Mpc. Riess and team have found about 73.2km/s/Mpc from the distance ladder, but uses the assumption of a deceleration parameter of q=-0.55. ~~ Another possibility which is ATM and won't be discussed much here is that the q=-1 leading to an estimated 75.5km/s/Mpc from Riess' analysis.~~

Does anyone know the answers to...How accurately will GAIA determine the Hubble constant? Will it be model dependent or model independent? Is GAIA likely to be able to help resolve the tension between the first two values above?

Thankyou.

Last edited by slang; 2018-Mar-20 at 10:12 PM.
Reason: strike-through added by moderator

"...when you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes