That would be a seriously bonehead move by Intel. First, not all of the Romley chipsets support SAS. Apple (and anyone else primarily targeting workstations) is highly likely to use the C600-A (which doesn't have the SAS feature turned on). That's going to be a big blow to the Mac Pro to sit on the sidelines for 2 more months for absolutely
zero benefit. Unless, the bug trickles back into SATA (like last Spring
http://www.theregister.co.uk/2011/11/28/intel_xeon_e5_sas_bug/ ), it does really make alot of sense. Smacks of an over reaction to having gotten burnt to the tune of several $100M on bug from last Spring.
They have already done a "defacto" rolling launch by shipping them in bulk to the SuperComputer vendors. Rolling the C600-A out in late January or early February would make more sense than blocking it all until an marketing event like CeBit. I can see holding back the super conservative server boards till then for a 'dog and pony' show, but it is going to be hard for them to keep all the vendors chained down with artificial delays.
I wouldn't be surprised at all for Apple to bolt out of the gate early with "pre launch" supplies of the parts. They aren't going to patiently wait for a Cebit dog and pony show. The only reason perhaps to hold off till March would be to announce an new E3 based model along side the E5's to tackle the "lower than $2,500 but higher than $1,800" price point. Since the Ivy E3's are due around April, they could announce shipping later with about a month lead time.