Hi Jillian,
Thanks for reaching out! I'm glad to hear that my comments have been helpful to you.
In regards to ADFS 2.2 vs. ADFS 3.0, they are actually the same thing. Technically, there is no such thing as ADFS 2.2. That's what people were calling that version, before Microsoft actually released it. Everyone was expecting Microsoft to name is ADFS 2.2, but instead the named it ADFS 3.0. So any time you see ADFS 2.2, please know that whomever mentioned it is actually referring to ADFS 3.0.
With that said, I am working to have our Marketo Community article updated to reflect the correct naming convention. Additionally, when attempting to authenitcate with Marketo using ADFS 3.0, the only existing solution is for NON-SNI supported clients only. The full support for ADFS 3.0 is coming to Marketo early next year, mostly likely within Q1 of 2015.
For now, if you'd like to authenticate with Marketo using ADFS 3.0, please refer to this article. It will step you through everything you need to make it work.
https://newsignature.com/articles/federation-adfs-3-0-sni-support.
Best regards,
Chris