October 24 was the date on which the official Android 4.3 update started to roll out to the HTC One flagship, complete with Sense 5.5. Now the HTC One Mini, the miniature version of the flagship, is getting the same treatment, though the download might be rolled out in stages and you’ll have to wait a little to grab your own.
That said, our own HTC One Mini has just received its notification. Aside from Android 4.3 and Sense 5.5 (which now allows you to disable BlinkFeed altogether, in case you don’t like/use it), there are additional improvements in the Video Highlights department, notification shade, updated music interface, as well as a cornucopia of BlinkFeed improvements and new features.
You can wait for the OTA to reach your phone or you can try to manually check for its existence.