One of the more distinctive new features of the upcoming Android L OS is the "Material Design" makover for which the keyboard experience plays a major part. A developer took the keyboard component off a developer preview, repackaged it into a standalone app and sold in on Google Play so users of older devices could get a taste of the new keyboard's look, feel and functionality. Well, Google's taken notice and taken down the app. Since developer simply took someone else's work and is profiting from it, he likely broke Google’s Developer Distribution Agreement.
Source: Phandroid