Today Google announced that Google Wave would no longer be developed as a separate product. The say that “At the time, we committed to maintaining the site at least through to the end of 2010. Today, we are sharing the specific dates for ending this maintenance period and shutting down Wave. As of January 31, 2012, all waves will be read-only, and the Wave service will be turned off on April 30, 2012”.
As its starts Google Wave was a very innovative product. Due to the fact that Google recently came up with Google+ it became redundand to some point.