The most recent update allows the WhatsApp app work faster and is more stable. The WhatsApp Android version has improved considerably in recent months, with some new features and lots of bugfixes. The last update falls under the latter,but was of less importance.
Although not many details are known about this update, the app feels faster and more stabler compared to previous versions.
Unfortunately, the option to change your online status to offline is still not available. For more than half year WhatsApp developer have been saying that the function would come out. iPhone users have long been able to hide their Last active status.
The update to the WhatsApp is free to download from Google Play Store.