Yes, there is a lot of new information in the latest edition - we're finding it to be useful.
There is a lot more about composting. He claims (and I've had this confirmed) that the majority of compost in the stores is much too homogeneous, coming from single sources, usually waste materials from other processes. He suggests buying 4-5 different bags of compost to provide more variety. He makes the same recommendation for a home compost pile. Try not to put more than 20% of any one material in there. This was good to know because we have a large lawn, and it would be easy to end up with 80% lawn clippings. Once we get the lawn de-mossed, thatched, aerated, limed, overseeded, and fertilized, (next week) I intend to mow more often, and leave most of the shorter clippings as mulch in the lawn itself. That will still leave plenty to compost. In the meantime, we're adding kitchen trimmings, coffee grounds, some sawdust, and we'll be adding all trimmings from the veggie garden throughout the summer.
Other new items -- they have found that 6" deep beds are adequate for almost everything, with the exception of carrots and a few others. Saves considerably on soil - although I still prefer about 11" (2 1x6 cedar boards).
Something else I'm going to try next year (my own invention) -- buy about 16 12"x12"x8"d square plastic containers with 1" lips on them. Fill them with Mel's Mix and plant them as individual sq ft sections. These can be planted very early in the season, and moved in or out of the garage to avoid frost in the early spring. Then I'm going to build a frame of 2x2's to hold these containers - 8' wide x 2' deep, and about waist high. It should be easy to mix and match various crops, move the individual containers around, plant flowers in some, etc. etc. Sounds good to me, but it won't happen until next year. These could also make good gifts to introduce kids to SFGing - perhaps 2-4 squares to get started.
ejg