I don't believe that the time (8 weeks or so) they needed in the past was because they did not have a software, but because of other issues, and these issues are, I guess, require manual inputs.
This is not year 1995 that we get substantial shift in the durations just because of change in software. Software are almost in saturated state, and a new software in 2008 will not bring that much of shift. Period.
If there is something related to the other issues, then I can believe, but I will assume that it is just a statistical shift, than the likely new shift for forever.
Only one reasoning you can give for the early result is on the syllabus change in civil engineering. In the past, the PM shift used to have a mix of other areas as well: e.g. Geotech major used to have 65% from geotech while other 35% used to be based on Water Resource and Highway engineering. If the civil engineering section is the main contributor to this 8 week length of time period for sending the result to examinees, then it can bring a dramatic shift this time onwards. It is possible provided they used to work in series in the past, not in parallel in resolving various issues that they needed to deal in the aftermath of exams.
Overall, my expectations will not be that optimistic (3 weeks or so early compared to the time in the past), but it can be 1 week or so: 8 weeks being the mean / average duration.
GeoCivil