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ISOW6441: Is ISOW6441 ready for new designs

Part Number: ISOW6441
Other Parts Discussed in Thread: ISOW7841, , ISOW7741

In consideration of ISOW7741 for isolated SPI with integrated power, I followed several links and landed on the ISOW6441 as promising for new designs. I see it is still in "Preview" status, so a few questions:  a) Is the ISOW6441 favored for future designs over the ISOW7741 and ISOW7841?  b) Is the ISOW7841 the nearest and best equivalent part leading toward future ISOW6441?  c) Assuming "Yes" for the first two, what is the schedule plan for releasing the ISOW6441?