At some point, you're going to encounter an app that won't run on your Android device. If you want to find out why, Google Play actually tells you -- you just have to know where to look.
The web-based Play Store is already a great tool to install apps remotely. However, if it says an app is incompatible, you can actually click the tiny plus sign next to that message to see why. For example, it might be that your carrier blocks the app, that your phone lack the required version of Android, or something similar. You can also see OS requirements, maturity ratings and more information along the right-hand side.
It isn't a new feature, but if you didn't know it was there, it can be extremely helpful.