The same behaviour is exhibiting for me.
The first notice in this chain about the problem was two weeks ago and really, it should be fixed or pulled now because it seems a bit odd saying it'll be fixed in June.
However, it may not all be the author's fault as I had the same thing happen to an Alex King "Category Overload" plugin that gave me his "404 Notifier" instead in the WP2.5 plugin upgrade screen. This was two weeks ago as well, although I haven't checked if it has been fixed as I just pulled it at the time. I was only trying stuff.
On a personal note, I'd like to thank all the plugin authors for their hard work and it shames us all to severely criticise them for work that they are doing for little or no reward. I'm sure they are doing their best. The software IS open-source so anyone can have a go at fixing the problems. I'm just sorry I don't have more skills...!