Second Gaia data release is tomorrow, 25 Apr 2018

[selden]

That's amazing. I wonder what the error bars will be like this time.

Some preliminary estimates were published in November. See https://arxiv.org/pdf/1710.10816

the preliminary values for the formal errors on the parallaxes are: 30
µas at G=15, 150 µas at G=18 and 700 µas at G=20.

where G "denotes the broad-band, white-light, Gaia magnitude."

Unfortunately, they also vary depending on where Gaia points on the sky.

More details are available at https://www.cosmos.esa.int/web/gaia/science-performance