It took a moment (not to say virtually forever) but we launched the SPHINCS+ website at https://sphincs.org. You can now find the full submission package as well as code and specification separately. In addition, we started to collect the most relevant papers to for our design and plan to collect all results related to SPHINCS+ on that page. So, if you do an attack against or an implementation of SPHINCS+ — please let us know.
SPHINCS+ website online