While looking for android on tegra information, i did come across some information which leads me to believe it is probably possible to get it to load. That doesn't mean it will by any means, or that anything will even display or that drivers exist for said system.
It may be possible to use an old trick to get it to boot windows though. The source for the linux kernel (i think it was the kernel) used on the switch includes the device tree for certain hardware or all of it (didnt thoroughly look at it all). This includes addresses that what i assume in my (before uefi) understanding are something like irq locations etc a bios use to map hardware, while also importing values from the tegra210.dtsi which seems to be related. If that is the case, it is similar to using a custom dsdt to fake device ids with compatible ones or fix other problems while doing something like Hackintosh. So something may eventually be cooked up.
That being said, it may be possible using coreboot/u-boot to do some custom job in loading some other stuff up like the Linux kernel. I'll probably fiddle with it myself for fun. I just wouldn't expect releases of Android 5, Windows ARM v{whatever}, etc. any time in the near future. You may hear developments from some people though, just don't get your hopes up until you see some stickies.
There are still a lot of things to iron out even with Linux seen up and running emulators. Plenty of patches to be made to improve the stability, performance, and versatility of the Switch's hardware.
Anyway, that's all I have to say on this or other OS topics.
