The new Toshiba SG5 SSD series will be available in 128GB, 256GB, 512GB and 1TB capacities as well as a couple of different form-factors, standard 2.5-inch and two different M.2 form-factors. 

As noted, the Toshiba SG5 SSD series is based on 15nm TLC NAND with yet to be details controller and will offer sequential performance of up to 545MB/s for read and up to 388MB/s for write.

The 2.5-inch version of the Toshiba SG5 SSD series will be available in all aforementioned capacities, the M.2 2280-S2 (single side) form-factor version will be available in 128GB, 256GB and 512GB capacities and the M.2 2280-D2 (double side) version will only come in 1TB capacity. 

The rest of the features are pretty standard for a consumer-grade SSD so you are looking at a power consumption 4.5W to 5.6W under load and 0.65W in idle and it includes Toshiba's QSBC (Quadruple Swing-By Code) error correction technology.

Unfortunately, Toshiba did not unveil any details regarding the actual price of the new SG5 series SSDs but did say that it should be available sometime during this quarter.