Compatible with iX?

The iTunes App Store is currently listing apps as compatible with "ix", or more exactly -- "compatible with iPhone, iPod touch, iPad and ix.Mac.MarketingName". That's almost certainly a glitch of some kind in the system and I expect Apple will fix it asap but it does make for a fun question -- if there is indeed an "ix" in the pipeline, what could it be? An app-compatible Apple TV? Cross-compatible Mac Apps? A 5 to 7-inch device? Something we haven't imagined yet?

While Apple sees to its stray text, give us your best guess -- what's "ix"?

[Thanks Ethan!]