I don't think a new edition will happen soon, I don't think she has been travelling the past couple of years because of the pandemic.
It's not the most expensive hobby related book I've bought by any means. And I'm happy to buy new editions just to support her and her writing.
But if you can find a local plant club, it's the sort of thing that would be good for the club to buy for reference purposes or their library. Unfortunately there's not really a better centralised source for plant information, nor is there any other real updated source for Crypt information either.
If I couldn't find information searching, the next place I would likely ask would be the AGA facebook group, I expect it's the most likely source for good information