I need a MBP for Xcode and I was going to wait for the 2016 model, but it seems that it will only have USB C and no USB A, HDMI, SD card slot, or MagSafe, and will release in Q4. Since this will probably happen, is it okay to instead buy the 2015 model now, since it has Broadwell, and isn't much of a difference from Skylake? Or is the 2015 already outdated?