When the Pebble team said that the Android version of its new appstore would be available "very very soon", that was definitely an accurate statement. Pebble released the iOS version of its appstore
earlier today, and now it has also released a version of that appstore for Android, although to be fair the Android version is still in beta.
There are a couple other issues, and Pebble has said that it will update the blog post if there are more issues found. Still, the appstore should work well enough to allow you to install some new apps on your Pebble. And, just in case the update causes more problems than expected for you, Pebble has also listed beta 7 of the Android app (which doesn't include the appstore) in the blog post.