GeForce RTX 5070 Ti reportedly features 16GB GDDR7 memory and GB203-300 GPU
videocardz.com
videocardz.com
More CUDA cores tends to mean more SMs, which means better performance overall. We'll have to wait until the benchmarks roll out to say anything for sure, but it looks like a good upgrade (and lord only knows Nvidia will price it accordingly).
But I think those are gap filler cards, at least in Nvidia's lineup. They're intended to fill the "budget 4k" market that needs enough memory to run high-res displays (or LLMs/crypto miners) but not the compute to fully saturate it. A sort of consolation prize for people that can't afford the 2080-tier cards but want a similarly large memory pool.
A lot of outlets see those cards and end up dunking on the XX70 models just because "memory lower" and I think they miss the point. There are a lot of users, particularly 1080p and 1440p users, that do want less memory that can run faster. As time goes on, I expect Nvidia to phase out 4gb cards for an 8gb minimum, with 16gb midrange (XX60ti, XX70) cards and probably 32gb flagship (XX80/XX90/Titan RTX) styled cards. Again though, it's anyone's guess.
Just a nitpick; the guess is sound (though I would expect 4GB to stay for the office PC market), and obviously only time will tell what they'll really be doing.
OTOH don't underestimate the power of artificial market segmentation - "oh, you want 16GB VRAM? Too bad, get a xx60 instead of a xx50. After all it's just 25% more expensive!".