Actually, only the public build is the 7th, and patron build is both the 7th and 21st.
Which means, as long as nothing is delayed, 50.0b will be in 1 week, with 50.1 being early June.
As r50 is a special milestone, Indivi plans to release the desert area, which should also include the desert town as well, which would add to Cassie's story.