Maggie, you're a genius!! I think you just solved the whole "I bought and paid for this 1.5 years ago arguement"
In answer to your question, if tickets went on sale in October or before and are sold out, yes, you should claim that it's "SOLD OUT" in October.
Using @MaggieL's show analogy, what everyone has bought and @wayTools have SOLD, is a virtual ticket, a place in line if you will. As with a show that is coming to town in December, tickets go on sale months, sometimes years, in advance. You are charged at the time of purchase to be guaranteed admittance to the show, when it actually takes place.
By making your TextBlade purchase, you are guaranteed a TextBlade when they are released. Consider the TextBlade the postponed show. general release will happen, just not on the original date. As with a show that gets postponed where you can request your money back if you don't like the new date, @WayTools allows you to request an immediate refund if you don't want to wait.
This perfectly fits!