Sure, Asian symbols would be just a jumble of lines to me, too, but that wouldn't stop me using the DAP! It really won't be long until the more complete firmwares will be released, anyway.
If I had the money available, and the DAP available, I'd buy it, and manage OK until extra languages are added.
If the X5 is as moddable as the X3, you could just add English support yourself :)
I have enough Chinese/HK friends where I can get them to tell me what is syaing what and then to just mod the files to add preliminary English support.
That is, if FiiO also releases a mod kit like they did with the X3