1) MicroG is partially functional. Most of the features are available, but some applications require Google Apps.
You can put Flame Gapps.
2) The official LineageOS will be released for sure! But I will not lead it.
Thank you for prompt answer! I'll buy this phone, then. I know I could install GApps this, but I'd rather avoid that for privacy reasons, especially that typically I don't use that many apps, and F-Droid contains almost everything I need.