Here's the relevant quote from the Engadget article:
Just be aware that you may lose some features you like -- as one early adopter notes, app support within Hangouts is currently missing. That doesn't necessarily mean that the support is gone for good, but you shouldn't count on it coming back.And here's Google's official statement:
The comments in the G+ thread are very interesting and there are some names many of The Tavern's readers will recognize.
Another interesting G+ thread: