Hi,
The reason for 1.6.6 pushed yesterday is a bug fix, serious for (though only for) people doing solo TWR with departures: traffic could not align on the RWY, and would even result in a crash on Windows.
As for the next version, the current plan is a 1.7 with a new connection type enabling to join FSD networks (with a tower view still rendered with FG). It is currently under test with the Dutch flight sim network.