Yes, it was noted that as of 2012. Originally it was 2010, then 2015, then 2020...so who knows what will actually transpire.
The TISB broadcasts traffic data, while FISB will broadcast the weather data (and only on 987MHz)
It should also be noted, that due to the bandwidth issues, in the US, below 18,000, the ac will have to switch to 978MHz UAT. The transponder will have to be dual mode in that respect.