Will there be any option to boot from SD (some jumpers/switches), or only from QSPI?
This is one of many issues I've been considering. Of course it depends on whether the 6 signals for SD cards manage to come to pads on the bottom side, and if you somehow add a SD socket. There's no way a SD socket can fit onto the small 1.4x0.7 inch form factor.
I'm actually considering selling 2 versions. The main/default version will come with the boot fuses set to only boot from QSPI. All the essential settings will be permanently fixed, so people can't brick their board.
An alternate "lockable" version, probably to appear ~6-12 months later (definitely not launched at the same time), will come with all the fuses unprogrammed. In fact, it won't be able to boot up at all, so to initially program it you'll have to press the button to go into bootloader mode. You'll be able to set the fuses any way you like. You'll be able to turn on security, even set up encrypted high-assurance boot, so people can't copy your code from the QSPI flash (or SD card). But the stakes are very high with this chip, because the fuses are true one-time programmed without any way to erase. The "lockable" version will come with very strongly worded warnings and a no-returns, no-refunds "you're on your own" policy.
I suppose there will be no hyperflash.
Definitely no hyperflash!
The chips are too expensive, they're too large to fit, and this first board won't have the 1.8V power supply they need.
Initially I'm probably only going to support running from TCM. Later we'll probably add support for XIP from QSPI with a software update. If you think only of hardware, this probably doesn't seem like a big issue, but some special things planned on the software side...
About SPI, I would prefer that there were two available in the 24 pins. Or if it is not possible, that is as in the Teensy 3.6, one of quick access in the 24 pins, and the other in the internal contacts.
It's looking like we'll have only one full SPI on the outside pins, and another with MISO & CS on the outside but MOSI & SCLK on the bottom pads.
This is one of the many choices I've reconsidered over and over. Two full SPI would be nice. But then we get 2 less XBAR (not enough to use all 4 quadrature decoders), 2 less FlexIO, and we lose the extra SAI1 signals for 6 channel audio. Since the FlexIO can also implement a limited feature SPI, losing all those features seems like a painful choice just to get the 2nd SPI.