Yes, the mid-summer SERPs have historically been quite "different" and then things shift again in fall, especially right as the holiday shopping season revs up. I assume we'll see some of the same this year and that we're in for a bumpy summer in the SERPs.
Right now I'm seeing something even further in the area of query revisions. First I am very happy that the original unrevised query shows up a lot more as a linked option, even though the revised query results are still served first.
But even more, for the term I mentioned earlier, I see a remarkable change. A search for "ABC DE" (with a space) used to be filled with results for "ABCDE" (no space). Now the search for "ABCDE" is invaded by results for "ABC DE". So something about the query rewriting algorithm changed by 180 degrees.
There are several other shifts in this area that seem quite new. There were actually four variations that used to be all piled together. Now that is no longer the case and the other two are being kept completely separate.
So there's a good bit less of the HAL5000 attitude of "Sorry Dave, we can't let you search for that."