Questions on PSTN Calling - PSTN breakouts map

I believe that location based routing is on the roadmap. I am not absolutely certain what "location based routing means" so I may be wrong but it would appear to suggest that rather than hit the UK datacentre then ping back across the Atlantic if your UK based licensee happens to be visiting the US and is calling a US PSTN number it would instead enter the closest (in IP terms) Azure network endpoint and then route from there. Anyway, I would suggest that starting to ask about location based routing would be a good starting point to get a handle upon your point.