Will this beta version stop working when the 1.0 will be available?
Yes, but this hasn't happened yet.
A recurrent nightmare I often experience is: I click on AU and a message says: end of trial period!
Is your system clock on the correct date, or are you a time traveler from the fututre? Please post a screenshot of this error.
It would nevertheless be helpful to have an inkling about the timing. I'd hate to have some unfinsihed project in Audition when that day comes.
Will it happen this year? Or is that a commercial secret?
Yes, it will occur sometime this year. Adobe should announce specific release dates very soon at which point, I'll be able to answer these questions more directly.