TRS's contract with 2K for Evolve has now ended, a message has been posted about it here:
This doesn't mean Evolve is shutting down, it just means that TRS is no longer the developer for that IP.
Here is what 2K have posted about it...
For those looking for answers about what 2K is doing with Evolve without TRS.
"Evolve Stage 2 servers will remain online for the foreseeable future running the latest version (v2.16) of the game."
"No future updates are currently planned, as development on Evolve Stage 2 is complete."
"2K will continue to evaluate the possibility of bringing Evolve Stage 2 to console, but maintaining and growing the game’s audience on PC is the primary focus."