Since 5070 seems to be full GB205, I'd expect 5060 Ti to be GB205 salvage with about 40-44 SM, possibly with 10GB GDDR7@160bit.
Considering GB207 is said to have less SM than AD107 (20 vs. 24), I'd then expect the 5060 to be GB206 with 32 or 34 active SM, with GB207 only used in a 5050 this time.
5060 might then get a 16GB clamshell version, basically I expect 5060 to be the new 4060 Ti.
I'd also expect Nvidia to price a 5060-16GB relatively close to that 10GB 5060Ti, so Nvidia-only buyers have a choice between getting ripped off now, or buy the 5060Ti and be forced to upgrade again in 1-2 years when 10GB VRAM isn't enough anymore...