Correct me if I'm wrong here, but don't they announce a new five year deal every year now?
It was a rolling contract with set increases. This new extention gives him a bigger raise for this year (replacing year 5 of the original).
It also has higher values for bonuses and higher values in the "Continued Employement as K-State Athetics Representative" section. Before, there was a clause that after he is no longer FB coach he is still a special assistant to the AD with set requirements for it, such as required appearances, as long as he is mentally and physically able. Before that was $150,000 per year. The new contract sets that at $250,000 per year.
Edit: I left some stuff out. The 2009 contract rolled on an extra year at the end of each year. However, it appears that rolling additional year ended after 5 years, so really the original 5 year contract effectivly maxed out at 10 years. It also set that the year 5 pay was the max pay, so in those extra rolling years he wouldn't get getting a raise. The new contract sets out a new schedule for him to get raises for the next 5 years. Under the old agreement he wouldn't have raises in 2014-2017.
Finally, the new contract removes the sentence "At the conclusion of Coach's last Contract Year as established in this Agreement, the University's obilgation shall not renew". It looks like they took off the effective 10-year cap that the previous contract had.