whether the bro 0.7 has been released and where to get it?

It has not yet been released. I am thinking of waiting on the release
until I can finish a draft of the first part of the user manual (describing
the language in detail). If enough people are interested in the new release
right now, though, then I'll put it together without waiting on the manual.
There are a lot of new features, but without documentation for them, using
them remains challenging!