Tell me - hot state tax issue of 2015?

In preparation for a State Tax Notes article I'm working on for publication later this year, I'd appreciate your input on what you think are one or two of the most meaningful state tax issues for 2015?  For example, perhaps it is the Wynne decision, Justice Kennedy's comment about Quill in the DMA case, the revised Marketplace Fairness legislation (H.R. 2775), accountability measures, some states trying to reduce income tax and increase sales tax, expiration of the Internet Tax Freedom Act, taxes on short-term rentals, worker classification, marijuana taxes, something else?

Please post a comment here or if you don't want to do that, you can email me at annette.nellen@sjsu.edu.

Thank you!