The new device reported by this blog, is Huawei's E180.
The older model was being sold for 60KD, while the new one is being sold for 45KD.
Here's my advice: If you already own the old model, stick to it as there's no need to get a newer one.
The so called "speed" of 14.4Mbps, is the network speed, not the Internet speed. The network here is the communication between your mobile device (the E180) and Zain's communication tower.
People with the older devices, that have a speed of 7.2 Mbps, would never get 7.2 Mbps of Internet speed, because again, that's the network speed only.
Also, the E180's link above doesn't mention anything about supporting 14.4 Mbps, as the blog claims (or Zain claims).
Plug & Play option is great. It also exists in the older model.
Support for Windows & Mac is great. The older has the same support, and it also supports Linux. I'm using mine on Kubuntu.