You read it right - one of the most popular apps on Android, and long-time holo holdout Twitter, has finally updated its look. And it's nice.

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The new 4.0 release has an all-new feel, and improved hashtag and mention support in the search and compose windows. You also now tap and hold on tweets to bring up the action menu (reply, retweet, favorite, share). Here's the full changelog from the Play Store:

New in this release of Twitter for Android:
- We’ve got a brand new look and feel crafted for Android 4.0+. Navigate seamlessly between your favorite parts of Twitter with a simple swipe.
- It’s easier to connect with friends and join conversations with @username and #hashtag suggestions that appear as you search or compose a Tweet
- Discover, install and launch your favorite apps from Tweets
- Other bug fixes and improvements

Apparently, you can install and launch apps directly from tweets - an option will appear in tweets with certain content (eg, Foursquare checkins) to launch an app, or install it if you don't have it. You can read more about the update at the official Twitter blog, as well.