Big brother to the BT878. Has specialised DVB support in a new PCI function, instead of using the digital audio input for it. (Yay!). In fact it has stacks of functions, like 6 or something, but fortunately they all share the same (huge 16MB!) memory mapping. Has the same (identical?) RISC programs as the BT878 and the same kind of i2c bus control.
But really for DVB I don't think it gives you anything that the BT878 doesn't. If however you want to put analogue video on the same card (like DVICO do) then it seems to have a few improvements in that department.