A Samsung outdoor advertisement sits atop an office building in Seoul, April 5, 2013. (Credit: Reuters)

Seeking to cash in on the overwhelming success of its fourth-generation Galaxy smartphone, South Korean firm Samsung is reportedly working to introduce a number of devices under the Galaxy S4 brand.

Technology website SamMobile, claiming to have received an official listing from insiders, revealed the release date of Samsung's Galaxy Mega, Galaxy S4 mini, Galaxy S4 Activ and Galaxy S4 Zoom. According to the document, the white variant of Galaxy Mega 5.8 will be released in week 20 of this year i.e. between 13-19 May, while the black variant will be released between 17-23 June. The white variant of Mega 5.8 will be revealed in May and the Black variant of the same device will come out in June.

The website also stated that Samsung Galaxy S4 mini, the miniature variant of Samsung's flagship Galaxy S4, is expected to be launched in July. The black and white variants of the Mini will make its debut around the same time. Galaxy S4 Mini is speculated to sport a 4.3-inch Super AMOLED display and run on Android v4.2.2 OS Jelly Bean powered by quad-core processor (Single-SIM variant). The dual-SIM variant is expected to pack a dual-core processor.

The next device which was listed in the report is the camera-centric Galaxy S4 Zoom housing an impressive 16-megapixel camera. Galaxy S4 Zoom is said to hit the retail shelves in early June. The black variant of the handset will make its debut first followed by the white model.

The last model - Samsung Galaxy S4 Activ - is a rugged version Samsung Galaxy S4. The water and dust proof device will come is said to arrive in a metallic orange colour and is anticipated for a release in July.