Not really pal. TBH, the expansions are all to do with whether you need a further 8 channels of ADAT, or if you need additional channels of TDIF or AES/EBU.
The system already works AES/EBU and has 24 channels of TDIF I/O, optical digital I/O, 2 stereo digital inputs switchable between AES/EBU and 8 channels of ADAT. So you are already covered in the important departments. The only thing that does wet my mouth would be the analog board. 8 channels of that could come in handy.
I believe there is the firewire option available now, IF-FW, but I could be wrong here. There is no dedicated surround but it is supported with channel assignments. You also have the 4 auxes to play with. I would have loved more onboard metering as that is limited on the DM, for now..Just remember that if you work off 96kHz throught the signal path then your mixer, effectively, becomes a 16 channel console.
But as it stands, it's already a monster.