Has google talk been abandoned?

Today Customize Talk announced that it would be shutting its doors due to lack of updates to Google's instant messaging client Google Talk.

On August 24th 2005 Google Talk was launched. It has now been three coming up on four years since the official release and we still only have a windows client. In November 26th 2007 two years later group chat was finally added. Not much else has been added since then. There have been updates to the web based google talk clients, but none to the desktop application.

One has to ask, has the google talk desktop client been abandoned? Or have developers been pulled from it to focus on other products?