A discovery by a Hardwareluxx forum member seems to indicate that NVIDIA might have scrapped plans for using the GA102-250 in the RTX 3080 TI and, instead, repurpose it as GA102-300 for the RTX 3090. This still leaves the possibility of a GA102-225 with 12 GB GDDR6X VRAM launching as the RTX 3080 Ti some time in May.
https://www.notebookcheck.net/NVIDIA-found-repurposing-lower-bin-GA102-250-originally-thought-to-be-the-RTX-3080-Ti-into-GA102-300-RTX-3090-GPUs.529398.0.html