Even as the hype over Samsung Galaxy Note 4 continues to grow, the South Korean tech titan might have just revealed the most sensational features of its upcoming flagship smartphone.

A recent post on Twitter from @SamsungExynos says, "Security can be improved using features unique to us. That's what we envision. What would you use?"

Samsung's teaser came with hashtag poster #ExynosTomorrow and revealing the sketch of a hand-holding smartphone. In the smartphone's center there is a picture of an eye along with a picture that seems to be tracking a target encircling the eye. The poster image includes a text "Unlock the future."

Smartphone aficionados who have seen the post have already made several guesses, some of them referring "retina or iris scanner," while some other mentioning "fingerprint scanner." In fact, one user @Dozysparks has remarked that an "iris scanner sounds awesome," another user @H_Rawand commented that he is unable to wait for the retina scanner.

While Samsung is yet to confirm the hottest feature of the upcoming Samsung Galaxy Note 4, it is belived that the retina scanner may prove to be the major USP of the company's net flagship smartphone.

Meanwhile, Trusted Reviews has said that the Samsung Galaxy Note will have an early September release, probably during the Independent Financial Advisers' (IFA) Conference in Berlin.

Apart from the teaser, rumors are rige that the upcoming flagship smartphone from Samsung will sport a 5.7-inch display screen together with a 2560 x 1440 pixels screen resilution. It is also anticipated that the smartphone will have Exynos 5433 octa-core processor having 32 GB RAM and 32 GB internal memory, which can possibly be expanded through the microSD card, similar to the existing Samsung Galaxy smartphones.

In addition, Samsung Galaxy Note 4 will be powered by Androin KitKat 4.4 and is likely to sport a 16-megapixel rear camera plus a 4-megapixel front facing camera having optical image stabilization.