yes...
Fragment of a discussion from Wiktionary:LiquidThreads testing
I appear to have become some sort of message which is not delivered through the conventional editing of my user page. Why is it so? What is its purpose? Is it going to supplant our traditional way of addressing each other (on user talk pages)?
Say hello to LiquidThreads.
It has been installed now, as I already announced on the BP. Yes, it will be the new way to leave messages, and you will have to live with it.
New messages can still be posted on your talk page I think. The so called new messages only mean that someone has responded to your post in a liquid thread.