Latest  * Few other suprise gadgets can also likely to announce in march during mobile world congress in barcelonia..

Hottest Smart Phones & Mobile OS launching in 2013

Samsung Galaxy S IV  

Rumours said that the Galaxy S4 will come with the S Pen stylus which is already being used in Galaxy Note and Note 2. Moreover, it will be equipped with 5 inch AMOLED display and an ultra slim design (world’s thinnest), 13 MP camera, 2 GHz 4 Quad Processor, Android 5.0 Key Lime Pie.The most recent rumour has claimed that the Samsung Galaxy S4 could be released in April 2013.

BlackBerry 10 

BlackBerry 10 is an upcoming proprietary mobile operating system, developed by Research In Motion for its BlackBerry line of smartphone and tablet handheld devices.It is based on QNX which was acquired by RIM in April 2010. RIM has claimed that there is no single line of code from the current BlackBerry legacy OS present in the new QNX based OS. The platform was originally called BBX but this was changed when RIM was blocked from using the BBX trademark after legal action from BASIS International, who already uses it for their software.

Retina iPad mini
After Apple unveiled its 7-inch iPad to the world this past October, everyone scolded the Cupertino company for its decision to exclude the Retina Display. So it comes as no surprise that talks of a next-gen model bearing the industry-leading panel have come to fruition. According to reports Apple is close to putting the iPad Mini Retina into production and has even pushed up its launch date. All other details remain unknown.
Sony Xperia Z / Yuga
Xperia Z reportedly sports a 5-inch 1080p (1920 x 1080 pixels) display at 440ppi with Sony's Mobile Bravia Engine and runs on Android 4.1.1 Jelly Bean. It is powered by a Qualcomm Snapdragon S4 Pro quad-core processor with 2GB RAM and 16GB internal storage, which is expandable by another 128GB.
Other features include a 13-megapixel rear camera, micro-USB as well as USB host mode, 802.11 a/b/g/n in both 2.4GHz and 5GHz modes, Bluetooth 4.0, LTE and NFC.

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Engineers World thinks that Mozilla Firefox mobile operating system and Blackberry 10 will be topic of hot discussions in 2013. Samsung Galaxy S IV may likely to overtake Apple in current year..