Ironically, the tools of the trade really haven't changed much since the days of the A330. Airbus published a series of papers on their fly by wire system. I do not work in the airline industry directly, I do UAV work designing control systems. It's interesting when I talk to friends who do work for Rockwell Collins and such. They use the same tools I do when I design control systems. A330 used automatic code generation which I have also been using. Things have improved in usability and such as anyone would expect. Most of this isn't an issue of raw horsepower, but of design tools. A redesigned A330 would probably use a different digital bus, serial buses would be ethernet or optical, but the control laws would be very similar.
My point is that I think the design would be similar today because there is a reason they made the choices they did. I'd really love to talk to some of the Airbus designers.