In case you've been wondering when exactly Twitter would get around to optimizing Twitter for Android on ICS devices, we now have an answer for you -- and that is right now! In fact, as noted on the Twitter blog earlier the optimized version of Twitter for Android is now available in the Android Market.
In addition to the optimizations, Twitter has also announced support immediately for the Amazon Kindle Fire as well as forth coming support for the Barnes & Noble NOOK Color and NOOK Tablet. Also of import is that you can swipe a tweet to reply, retweet, share or view profiles.
Source: Twitter Blog