Thought my pair of S5's would ship on 08 Jan. but got notice they shipped yesterday (via BitMain on Amazon).
Are those B3 ones direct from Bitmain? if so that's weird they would ship before B2.
The Amazon sale was linked to B2, which was scheduled to ship on Jan 4th if I recall. Amazon used different dates such a early February as the latest delivery date but they now have tracking information indicating that the shipping label has been made but they have not left the factory yet. UPS indicates a delivery of Jan 7th for the US west coast.