New Plus edition of the original Samsung Galaxy S II i9100 smartphone will be available in two variants. This unannounced Samsung smartphone should come in the GT-i9105 and the GT-i9105P, according to sammobile. The Samsung Galaxy S II Plus GT-i9105P will have an NFC chip, while the other one is without it. 
The upcoming Galaxy S II Plus GT-i9105 and GT-i9105P will sports a 1GHz dual-core processor and 8GB of internal memory. As a comparison, the original S II i9100 brings a 1.2GHz CPU.
But Samsung Galaxy S II Plus will launch with Android 4.1 Jelly Bean operating system. New smartphone should provide a 4.3-inch touchscreen display with a resolution of 800 x 480 pixels, an 8MP camera on the back with Flash, and a 2MP forward-facing camera.
Dimensions of Galaxy S II Plus are 125.3 x 66.1 x 8.98 mm. Both versions of the Samsung Galaxy S II Plus could be official unveil in January 2013.
Source
Samsung Galaxy S II Plus GT-i9105 and GT-i9105P smartphones as soon as next month
Galaxy S II Plus to come in 2 variants
Samsung Galaxy S II Plus (GT-i9105 and GT-i9105P) smartphone officially announced | GadgetFolder.Com
Jan 10, 2013 -
[...] has finally official announced a new Android smartphone, the Samsung Galaxy S II Plus. According to press release, the Korean electronic manufacture is introduced two editions of this [...]