Quad Balanced Pre-Amp

Am in the market for a pre-amp to go in between my Oppo 205 and my Mcintosh Mc275 VI. Mcintosh just released their new pre-amp, the C49.  Anyone know what advantages their are to a quad-balanced pre-amp?
'quad-balanced' appears to be a marketing term for their DACs.
Odd that its a balanced preamp and doesn't have balanced inputs for the phono, since phono cartridges are balanced sources.
Quad balanced is the marketing term used on their newer amplifiers. 
The C49 is about $500 more than the C47. Does the C49 have $500 worth of upgrades? Looks interesting though.