"FLASHBOLT" 16GB
Samsung nnounced the market launch of ‘Flashbolt’, its third-generation High Bandwidth Memory 2E (HBM2E) at a capacity of 16 GB.
wccftech.com
No, they have scaling for their HBM2. Also, 16gb is "gigabit", i.e 2 gigabytes. HBM2 still isn't that cheap and clients can customize orders i.e halving the amount of memory per stack.
If 32GB would cost too much (and for a game console aiming for $399 or even $499 realistically, it would be), a company would probably rather cut down on the total amount to something more manageable but keep the bus rather wide (since that's one of HBM's selling points). Plus, the bandwidth per stack stays the same regardless of the amount of memory on the stack, same with the bus width. Those would only scale upward if more stacks are present but their price only increases in relation to number of stacks and how much memory is in the stack.
So to keep BOMs manageable and still provide something of a selling point hardware-wise, makes more sense to cut the RAM amount to 16GB on two 1024-bit stacks. There would be a lot of benefits for that with gaming-related tasks even if many gaming algorithms and such use mastered/matured compression techniques.
They said just today that their timing will be comparable to what they did the last time.
But what you said about showing what they want made me think. If they are as close in performance as many are saying, let's say PS5 is 12.9 and Series X 12.1. That's close enough so Microsoft could overclock their APU to bridge the gap. So, in that case, would it make sense for Sony to say their exact teraflop numbers at this point in time? Wouldn't it be wiser to wait until after E3 when it would be too late for Microsoft to react?
Neither company has to actually make those kind of adjustments as a reaction to what the other one does; if they see a path internally to increase system capability by pushing the clocks up, and performance doesn't take a hit and no further components have to be added to the BOM to manage the increases...they will do the increase. MS and Sony do not have to wait on each other to show anything to do these kind of things, they are both going to want to maximize the performance of their specs.
The main reason MS reacted with increasing clocks in XBO was because they hadn't even designed XBO as a primary gaming device in mind, so they did not have the mindset to maximize the specs they had because that would have been "overkill" for what they assumed was already more than strong enough for multimedia functionality. When the "TV TV TV!" multimedia focus backfired, they had to reorient the focus with the hardware at the last minute so they took advantage of headroom already there, and bumped up the clocks a bit.
Things are different this time, however; they are clearly developing XSX with gaming as its primary focus, so they aren't going to wait until Sony "reminds" them, in order to take advantage of the maximum potential of what specs they already have. At the first available opportunity these internal teams see room for an increase, they will push for those increases (again, considering as long as they don't require additional costs in components to implement, otherwise further verification from higher-ups (suits) would be needed to OK things so they could implement such things).
Same thing applies to Sony, assuming they are designing PS5 with same focus as PS4 and I'm assuming they are.