Those numbers are important because they are part of the changes that make Analytical Writing (earlier called the Analytical Writing Measure) trickier and more demanding on the Revised General GRE,which was released in August last year.
So, what are the changes? Firstly as noted above, the essay section is now called just Analytical Writing (or AW for short). The ETS has been making changes in various aspects of the GRE test to make it more like the GMAT. This is one of them. The second is that the Issue Essay is now just for 30 minutes rather than 45 as earlier. This again, makes the GRE more like the GMAT.