IPCC deadlines

http://klimazwiebel.blogspot.com/2012/01/ipcc-deadlines.html
Would it not be much more reasonable that IPCC authors focus on established science regardless of the stamped date of publication ? To be honest, I was quite amazed to see in the drafts of the circulating IPCC reports references to studies 'in preparation', of course in preparation by the authors of the Report themselves