I hope they don't waste the money on wifi. Not all that many folks that use it especially in a mining situation, as it's nowhere near as reliable as standard Ethernet (it's also slow, but that's not really a factor for a miner due to the low needed datarate).
I doubt they'll go 3 boards or the 800+ watts a 3 board unit would need, that would have broken THEIR existing Hashnest setup and you can't reasonably run 2 such machines from those 1600 Watt PS they also sell and are likely using on their own farm hardware.
For similar reasons *AND* lack of board space, I dount they'll put 3 strings on one board with the BM1385 - 54 chips would be a NIGHTMARE to keep the corner chips cool on their current board form factor.
Price above $1000 is unlikely unless bitcoin pricing JUMPS soon.
I believe it will be powered by their new psu and will run around 6 Th at 1400w. If not the S7 the S7+ or S8.
S7+/S8 (whichever they decide to go with for a "BIG" unit) will be a lot more TH - I'd guess ballpark 10.5 TH at 2400 watt ballpark in a S5+ form factor. It wouldn't make sense for their "new big miner" when they come up with it to be lower TH than the S5+
S4+ would NOT have fit as an S6 - it was the BM1382 NOT the BM1384. S6 would have fit the S5+, though they may have decided that since it's not specifically a rack mount unit it wasn't really fitting for the S6 name.