It was revealed earlier this month that Super Smash Bros. for 3DS will not support the Circle Pad Pro add-on.

Many fans were disappointed by this news and commented on how the c-stick on the upcoming New 3DS would be supported, which in theory, would give players an unfair advantage on that system. Well, it turns out this was due to a hardware issue.

In an interview with Japanese magazine Famitsu, Super Smash Bros. creator Masahiro Sakurai explained that the amount of power needed for Circle Pad Pro just wasn't available.

Supporting the CCP requires the use of some of the CPU's processing load. From the information received during the development of Kid Icarus: Uprising, this is quite a large load (at around 5%). Kid Icarus: Uprising and Smash both use the maximum capability of the device, so we had to abandon the idea of CCP support. With the New 3DS, we were able to support the C-Stick as the processing power is increased and it is not a peripheral device.

Sakurai

While this is disappointing to hear, it does seem that the developers included many control schemes in the game to make up for this issue. As for players gaining in unfair advantage on the update 3DS model, we'll just have to wait and see.