Microsoft Bing is testing topics refinements options in the search bar, this is similar to what Google Search launched a few months back on mobile search and has been testing on desktop search.

This was spotted by Khushal Bherwani and he posted a couple screenshots on Twitter, here is one of those screenshots:

Here are more:

I do kind of like these topics and it is neat to see Bing testing them as well.

Forum discussion at Twitter.