512GB MicroSD card on sale in July

That's cool, but microSDs are usually pretty slow and have low long term endurance (their speeds drop by a significant margin after you use them for a bit). I'd like to see higher reliability and faster speeds that are close to matching the speeds of internal flash storage in mobile. Adopting UFS 2.0 should be a priority over increasing the size.

I'd also like to see microSDs adopt an open source file system such as F2FS and dump the patent-encumbered FAT32/exFAT. Yeah, Microsft won't take that lying down, but if all microSD makers and device makers start pushing for it, I'm sure Microsoft will eventually support an open source file system - it is the "new" open-sourcing-loving Microsoft we're talking about, after all!