I will play with predictions.
March: Not redesigned MBP, just updated, to latest hardware, and with USB-C and TB3.
13 inch, and 15 inch. No dGPU model on 15 inch, that will be later in the year.
13 inch will start at 1299$ with base CPU with 2.9 GHz with HD550, 8 GB of DDR4 2133 MHz and 256 GB of SSD.
15 inch: 1799$ 2.6 GHz, 16 GB of RAM DDR4 2133 MHz, and 256 GB of SSD.
Later in the year we will see new Macbook Pros, with new design, with same hardware, but 15 inch will have dGPU from AMD Polaris lineup.
13 and 15 inch will be offered alongside the new Macbook Pros for quite some time.
The 15" definitely needs a price drop regardless, especially since they don't even offer a dGPU in the base model.