I see an Alibaba seller offering Antminer S11 pre-order for $2900 - $3500.
Features:
Pre order of Bitmain AntMiner S11 22Th/s with PSU Preorder Ship on May 20-June 20:
Hash Rate: 22TH/s depending on batch. Variation of ±5% is expected
Power Consumption: 1340W; at the wall, with Bitmains APW3 PSU,93% efficiency, 25°C ambient temp; expected discrepancy of +10%
Power Efficiency: 70 J/TH; at the wall, with Bitmains APW3 PSU, 93% efficiency, 25°C ambient temp; expected discrepancy of +10%
Rated Voltage: 11.60 ~13.00V
Chip quantity per unit: 189x BM1387
Dimensions: 350mm(L) x 135mm(W) x 158mm(H)
Cooling: 2x 12038 fans; Front fan: 6000rpm, Rear fan: 4300rpm
Operating Temperature: 0°C to 40°C
Network Connection: Ethernet
Frequency: Automatically set
If this listing is legit, it seems the S11 will have the same number of chips as the current S9 and they even managed to push more hash (almost 2x of a 13TH S9) out of the BM1387 chips that power the current S9s with the miners running more efficiently at the same time. Quite impressive if these specs are actually real.
For those interested in taking a look at this purported S11 on Alibaba,
here it is.