Samsung appears ready to unveil its next Galaxy S smartphone later this month at the Mobile World Congress in Barcelona.

The event will be Feb. 24 and Samsung posted a teaser message on Twitter telling fans to "Mark your calendars." The message mentioned the meeting in Barcelona plus the term "Unpacked" with the number "5" superscripted.

According to Reuters, the "Unpacked 5" message was printed on invitations to the event and the mysterious announcement comes about three weeks after Galaxy S4 sales numbers were weaker than expected. New features for the company's next smartphone are not expected to improve sales drastically given the competition of other companies like Apple.

Samsung's next smartphone, presumably named the "S5," is expected to have a larger screen, improved rear camera and possibly a retina recognition scanner. With an increasingly congested market for high-end phones, the S5 may not be able to improve Samsung's sales all too much.

Apple is also expected to launch a new iPhone with a larger screen and improvements to the fingerprint scanner as well as a smart watch. Already with the Galaxy Gear smart watch on the market, Samsung could also release a second version of the Bluetooth wearable device.

Officials from the company have not confirmed the release of any products at the event, USA Today reported. Samsung did release the Galaxy Note 3 and Galaxy Gear at a similar unpacked event in the fall, though.

All signs indicate that the new Galaxy S smartphone will be the main reveal of the event, as well as the next Galaxy Gear. Samsung's executive vice president of mobile business Lee Young Hee told Bloomberg News in Jan. that the company will launch the two aforementioned devices by April and will also boost marketing for tablets.

"We've been announcing our first flagship model in the first half of each year, around March and April, and we are still targeting for release around that time," Lee said. "When we release our S5 device, you can also expect a Gear successor with more advanced functions, and the bulky design will also be improved."

Lee said the next Galaxy S smartphone will have key differences from its predecessors.

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