NVIDIA could keep the design similar to RTX 30 series for its next-gen Ada graphics cards.
Assuming that those photos are real, NVIDIA would keep its dual-axial fan design, with two fans pointing in two different directions. Furthermore, with a quick glance, one can notice that RTX 4090 heatsink has more fins than RTX 3090 Ti cooler.
The RTX 4090 Ti heatsink would be quite similar to RTX 3090 Ti in terms of design and the fact that Founders Edition (NVIDIA reference model) will retain its V-shaped PCB layout. The baseplate is much larger, though, as confirmed by the photos from TechPowerUP RTX 3090 Ti review. This SKU is considered a test vehicle for AD102 GPU.
Furthermore, photos of the RTX 4090 TI frame were among the shared photos. Due to the nature of this leak, which is a very poor resolution of the original photos, one cannot be sure that those are indeed real photos or rather a Photoshop attempt.