Increasing numbers of reports are coming out that 2C is no longer possible. And mainly because even if the countries keep to their voluntary INDCs, it's too little too late.

Here's one blog's analysis that points out that we've got models that are based on reductions in emissions in the past that simply didn't happen, combined with hopeful dramatic and unrealistic reductions in the future and speculative negative emission technologies implemented on a huge scale. When they've never been demonstrated or tested and we haven't yet actually managed to reduce our emissions year on year.    
http://cassandralegacy.blogspot.co.uk/2015/11/fighting-climate-change-do-we-need-time.html

Pop-Sci version.
http://cleantechnica.com/2015/11/27/indcs-still-fail-halt-warming-2c/

Source material. A meta analysis of climate scientists models.
http://kevinanderson.info/blog/duality-in-climate-science/
In plain language, the complete set of 400 IPCC scenarios for a 50% or better chance of 2°C assume either an ability to travel back in time or the successful and large-scale uptake of speculative negative emission technologies. A significant proportion of the scenarios are dependent on both ‘time travel and geo-engineering’.