HTC has recently pulled some of the core applications out of its Sense user interface and made them available separately through the Google Play Store.
Both the Sense keyboard and Sense clock apps have appeared in the Play Store in recent days, which can now be updated independent from full OS upgrades.
Google and Motorola have taken similar steps with some of their apps, such as their camera apps.
HTC already offers a handful of other apps via the Play Store, including Gallery, Blinkfeed, Sense TV, and Dot View.