The process is in fact quite simple. To activate the new interface of Twitter (dubbed New New-Twitter), you need to sign-in on the new Twitter clients for iPhone or Android.

Oh wait… How do you get one of these apps if you do not own an iPhone/Android? One way is to install the app on the Android SDK Emulator, but there’s a much easier way – Bluestacks.

 

Step 1. – download BlueStacks App Player for Windows (117MB), which is an Android emulator for Windows. Follow the instructions & install it.

 

Step 2. – get the new Twitter 3.0 app for Android. For that we need the Twitter 3.0 apk, which I found here. Use any of the following download links:

http://www.filesonic.com/file/4138517654
http://depositfiles.com/files/utkmkwe8s
http://www.uploading.to/w36x13irdqrk

 

Step 3. – The problem with BlueStacks is that it only allows you to install apps available from its own website or apps which you already have on your Android device. Fortunately, while searching on xda-developers, I found this thread which explains how to install .apks on BlueStacks.

How to install apks from the computer (WARNING: Apps installed this way CANNOT be removed):
1) Right-click on the .apk file and click on "Open with..."
2) Click on "Browse..."
3) Navigate to "C:\Program Files\BlueStacks" or for 64-bit computers, "C:\Program Files (x86)\BlueStacks"
4) Double-click on "HD-ApkHandler.exe"
5) Click on "Ok"
Bluestacks will install the .apk file and notify you when its done.

 

Step 4. – Enter your login details in the Twitter app & launch it. You can post a few tweets & use it for a few minutes where you’ll notice that BlueStacks has inverted scrolling!

Now go back to twitter.com, logout & then sign-in again. If you’re lucky, the new Twitter design should appear! If not, cross your fingers & wait for a few hours… :)