"There is no Apple support, though, for the SDHC and SDXC formats."
Wrong. The SD card slot does support SDHC. http://support.apple.com/kb/HT3553
Anyway, the SanDisk commentator is making a huge leap of logic to say that because Apple have put an SD slot in their MacBook Pro, they are about to build a tablet with an SD slot.
I'm not so convinced.