When grasshopper first launched it was fairly bare bones and surprised everyone with its success. The development of plugins continues to drive its popularity.
In GH2 we’ve have a number of developers involved in bringing up the component parity as well as Documentation and Core Development (K, Mathais, Ehsan, Andy, Curtis, Daniel, Will, Giulio, Callum, Kike, Luis, Pierre, …)
Grasshopper 1 isn’t going anywhere, Gh2 has passed some major milestones (hence the feature announcement) but its going to take time to get its plugin ecosystem going, how these two track only time will tell. It’s safe to assume both will be in Rhino for the foreseeable future.