Went to Google Voice today and found a newly introduced link to http://www.google.com/contacts.
This contact system is going to replace the Google Voice contact system soon. Google Voice Contacts has long used Google's OLD contact system because it had implementations for doing things like custom voice greetings for different callers and setting up rules to determine which groups of callers would ring which phone.
Could this be a move toward merging Voice with other Google services and possibly more? I think it is an indication that there is something is going on. It looks like the news is that Voice could be moving to using the existing Contacts function instead of its own Contacts function and that the existing Contacts function is going to be enhanced with Voice features.
All the rumblings on the net about Google's messaging answer to things like iMessage and Facebook messenger and this particular development say this could all be true.
I also want to mention that the feature that could make Google's new messenger service a superior product to those other services is having the ability to associate your Google+/Google account with a phone number. Then people could message you by whatever means (a phone number, a Google+ name, etc...) and you could still use the same service to respond and receive notifications for those messages. This Messaging/Google Voice strategy could be a strategy that might drive people to use Google+. The new messenger would probably require a Google+ account. Its possible it could even be the default messaging app in android and doing that would certainly bring the users Google wants to bring to plus. Every single Android phone (which has 65% market share of smart phones) would be using a Google+ messaging service to text and communicate. People will want to use the Google+ website cause they can access their texts and messages there.