This way we can ensure high quality production, software and support. That also means high volume production - we will clear the the waiting list very quickly.
On top of that new accelerators come with a bunch of additional features: 16bit Audio, 2x IDE port for CF and CD-ROM, 100 MBit Ethernet and USB Joypad support. Along with SD card port and real-time clock.
V4 technology means C5 FPGA (V4) with twice the capacity of the C3 (V2). This will allow to fit all the V4 features into the accelerator.
And it makes it easier for software developers as all cards have the same features (like 16bit audio or 512MB memory) Being able to use same features everywhere does simplifie coding by a magnitude.