We have received reply from Electrum author. Plugin won't be included in wallet by default. Author believes it would create a law risk to add mixer into wallet. Our hook was merged so our plugin will work with new version, but it will need to be installed separately.
We have published an article at r/Bitcoin about how to use ChipMixer to avoid upcoming "declare cryptocurrencies" US law:
https://www.reddit.com/r/Bitcoin/comments/6jzc41/easy_way_to_avoid_upcoming_us_declare_btc_law/Hmm, i don't think that chipmixer is really breaking any sort of law. Because all it is is essentially giving you chips with preset values in bitcoin to compensate for the bitcoins that you send to the service. It's a simple concept, and dont think that it's breaking any laws. It's just like swapping a $100 note for multiple $10 ones, $20 ones, or any mixture of both.
I mean, if they can get it installed by default then it's great because bitcoin needs more privacy, but if not, that's fine too. Just happy that it works at all on electrum.
Thank you dev for the excellent work, as always!