Macau and HK are both Cantonese speaking regions. Given that the Infrastructure updates in the area make everything "closer" (in terms of travel time etc), what impact is this having on language?
Is this a Montreal type thing where most people are bilingual enough where it doesn't matter? Is Cantonese a de-facto street language in these South Chinese cities even if Mandarin is the official language?
https://www.scmp.com/news/china/society/article/2136237/why-...
From what I know, as education improves and movement of people across large areas increases Mandarin becomes more and more common. As for movement within a Cantonese speaking area, I would guess that it might result in the adoption of a more common "standard" Cantonese over regional dialects in parallel with the increasing prevalence of Mandarin.
People from Shenzhen speak Cantonese as well and Shenzhen is already connected to Hong Kong by subway. This Greater Bay Area is really just making something that was more unofficial official. Shenzhen is part of Guangdong province while Guangzhou, the capital of Guangdong is also about 45 minutes by train from Hong Kong. The Greater Bay Area is really more about making it more official that Hong Kong is related as a group with Guangdong.