It is worth noting that ASIC A&B segmentation should not be comparable to Navi XT and XTX variants that were previously available under some GPUs in the past. Those were pre-binned chips that gave AIBs a chance to overclock select cards a bit higher. The Navi22 segmentation is more or less an artificial power limitation.The YouTube channel claims the Radeon RX 6700 XT will be about 20 to 25 percent faster than the Radeon RX 5700 XT. The cards feature 12GB GDDR6 memory clocked at 16Gbps and will reportedly have a core clockspeed of 2500MHz to 2600MHz. The latter is reportedly not finalized yet. With a memory clockspeed of 16Gbps, the Radeon RX 6700 XT is expected to have a memory bandwidth of 384GB/s. That's 64GB/s below what's offered by the RX 5700 series, although it should be noted that the Navi21 has Infinity Cache.
Coreteks also notes the Radeon RX 6700 should follow in April. That version is expected to get 6GB GDDR6 memory clocked at 16Gbps.