It took a while (over a month), but WASP is finally available directly from the Firefox addons site. The delay was caused by Mozilla working on a major update of the site, which increased the queue to over 300 addons to approve.
In the future, WASP will always be available from there. This should not only increase the visibility and usage of WASP, but also make it easier to upgrade when future releases become available.
I'm still working on the next update, which will be able to analyze more solutions, provide new features and tweaks to the detection engine. I'm also keeping a couple of nice features secret because I don't want to commit to them right now, and to be honest, I'm not sure it's going to work! But if it does, it's going to be really cool!