The current rate is 1% annually.
20,000 x .01 = 200 annually
200 / 365 = .54794 per day (roughly)
.54794 x 7 = 3.84 BAY per week, by my estimation.
Within the next update or two, the plan is to up the staking rate to between 3 and 5% (1% annually were everyone to be staking 24/7, but this is how much we anticipate it panning out to be given that all BAY tokens will not be staking at the same time).
If you have any more questions, or would like to clarify things with the dev, feel free to visit the Slack! http://bitbay.market/wp-login.php?action=slack-invitation