Siri, the virtual intelligent assistant exclusive to iPhone 4S, will be improved and packed into most future Apple devices, if not all. Predictably, the voice-controlled technology might become a core part of the Apple brand.

According to Apple's newest patent filing intelligent automated assistant, many products and services, including computers, tablets, connected televisions, cameras, Web and e-mail platforms as well as vehicles, can be integrated with the voice-activated technology.

The patent specifically highlights e-commerce as one of its forthcoming features. With the help of the new functionality, Siri can find out and buy items online, such as books, movies, music and more, after getting the voice demands.

It means Apple can closely integrate the voice technology with iTunes, the iBookstore and even the App Store. Moreover, the company can also form partnerships with outside retailers.

The patent documentation also suggests that in future, Siri could become more intelligent - act as a participant in discussion forums, chat sessions, and support calls. The voice-controlled technology even can remotely control other device, including dialing telephones, controlling light and temperature and controlling home security devices.

Although the patent doesn't reveal when and where the Siri will be installed next, there's a rumor circulating that the forthcoming next generation iPad might be the lucky one.

Without doubt, the improved Siri technology will help to secure Apple's leading position in the competitive tech market.

However, Apple should not laugh too early. After all, the competitors such as Google and Amazon are equally powerful. The search engine giant is reportedly working on a Siri killer, codenamed Majel, at its Google X laboratory, which might be integrated in future Android devices.

At the same time, Amazon is also focusing on its own speech-to-text startup Yap, which was bought late last year. It's possible for Amazon to incorporate voice recognition in the future Kindle e-readers and tablets.