From the very beginning, back in the '90s, I worked on the principle that TLD extensions should reflect the country you are in, not the country you want to sell/info to. That was the way the web was promoted back then - at least outside of the US, which has always taken "possession" of the .COM/etc TLD as their very own. The initials WWW should have been a clue to (eg) G and (now) to Bing.
Until now G has been the only one to punish our UK domains, forcing us to add .COM domains just to keep the businesses running. Other engines respond properly to the search words, such as travel UK or travel USA.
If bing has now gone regional it's going to get worse.
I emailed Bing about this 8 months ago and received a standard reply about .com domains appearing in Bing US unless the content-language meta tag is used in the head section of the page or the http header. This doesn't make any difference or the fact the site is hosted in the UK. I have page 1 rankings for search terms in Bing US but the same terms are on pages 3 or 4 in Bing UK.
Bing should allow site owners to choose their market as Google does in Webmaster Tools.
NOT as google does. There are several market areas, not just local or world. For example, some of our sites are local but others trade with US, AU, NZ, EU and similar but not CN, KR, BR etc.
If they are going to offer that feature then do the job properly, not slapdash like G.
Of course, a large number of web site owners do not even know about webmastertools in any form, so why not go back to people specifying any required country in the initial search, as we used to (and still do in some engines)?