The last private mail I received from him regarding the topic was from October 2018. Considering the delays that I noticed from him so far I'm rather confident that he's still working on it.
This is good, i've emailed him and hopefully i get an email back, i'd like to help with more compiler features but for now i found anonymous functions really nice feature to have, and wish to focus on one thing at once - after seeing some examples of it in bero's threaded library examples (with anonymous functions, using threads to offload work, implementation looks way cleaner with that).