While one would normally associate a 6.2-inch display size with phablets, it is not the case with SM-T255. Multiple details like the lack of SIM-card slot, a model number, which is similar to the model numbers of other Android tablets from Samsung, as well as the product description in Wi-FI Alliance certification, all suggest that this Samsung device is not a phablet/ smartphone but a tablet.
As far as we can recall, only Sony has released a similar device when it launched a Wi-Fi only version of Sony Xperia Z Ultra last year in Japan.
Coming to the specifications of Samsung SM-T255, as the GFXbench listing, the tablet will come with Android 4.3, 1.2GHz quad-core Qualcomm Snapdragon 400 processor, 1.5GB of RAM, and 16GB of internal storage. The tablet will also feature an 8MP rear camera, 1.8MP front camera, NFC, GPS and Wi-Fi support.