I'm in a minority here, but I like the change.
Sure, top 3 going up and no play offs is technically fairest, but can be boring (promotion race this season would be almost over with Cov, Boro and Ipswich going up...maybe just one other team involved).
If you're going to have play-offs, I think they should be weighted so that the higher placed team have a meaningful advantage.
That doesn't really happen at the moment (3rd plays 6th rather than 5th..... and the 3rd and 4th placed teams get the second leg at home.....not a big deal).
The new format means that teams 3 and 4 have a measurable advantage over teams 5 and 6 who also have a measurable advantage over teams 7 and 8.
I might tilt that even further by having the semi-finals as a single leg at the better placed team's ground but I basically like the change that is coming in.