Yes, there are third party apps that have Arabic keyboard support for the Galaxy Nexus or any other Android device.
Galaxy nexus is better
The Galaxy Nexus was released on November 2011.
Yes. You can turn it on manually, and there's apps (ex: Google Maps, Google Navigation) that utilizes the feature.
Galaxy Nexus was created on 2011-11-17.
There's no Samsung Galaxy Nexus 2 model yet.
Sprint did offer the Samsung Galaxy Nexus during its run.
Since the Nexus S, Google brought out the Galaxy Nexus, Nexus 4, and Nexus 5.
no
yes
The Google Play Store and the Amazon Appstore are two good places to find quality apps for your Nexus 5.
The Galaxy Tab 7 inch stands out better than the Galaxy Nexus 7 Tablet.