Users with @googlemail.com will soon have access to Google Assistant. The code commit that I spotted today talks about implementing this change. However, I cannot say for sure when this will be available for everyone.
What is @googlemail.com?
Google initially was not allowed to use gmail.com in the UK and Germany because of a legal dispute. This changed sometime in 2005, and now users in Germany and the UK can have a @gmail.com email account. The two Google mail domains are interchangeable. Mails sent to email@example.com will reach firstname.lastname@example.org users and vice versa.
However, when Google Assistant was introduced, users with their primary email account on @googlemail.com was left out. This is changing.
The commit that I spotted today talks about adding @googlemail.com to the list of supported domains, alongside gmail.com and google.com.
This will definitely make some users around here very happy. If you are one of them, please drop by and say hi in the comments section.
G Suite users? Sorry, no luck for you folks yet. You will have to wait for some more time before this feature or rather product, reaches your doorsteps.