Hasbro never releases those numbers but there's general ballpark ideas, things you can sort of guess too... Nothing ever specific really. I think these will be produced in quantities that make them anything but rare ultimately, but their status as online only will make them mythical to some... It's like the TRU wave last year. People went nuts, but I'd wager there's so many of those they're nowhere near rare, they're just harder to find than say Endor Rebel, or Senate Guard, or Hoth Luke.
That EU Wave, there's tons on Ebay all the time and they rarely sell for what the asking prices are. "Rare", and even extremely HTF, are terms I'd hardly ever apply to anything modern.
It's like the Naboo Fighter... I want one and by all accounts you won't get one right now, but that doesn't mean you won't eventually, and for a very good price too... Patience is what modern's about, to me. Wait things out and eventually you'll be happy. I buy most stuff when I see it if I want it. That's just me buying what I want when I want to. I'd be so far ahead if I'd waited on 90% of it though, haha.
I still look at my Commtech reader in disgust.