Yep, it certainly sounds as if they're expecting a change.
I find it interesting what they (some of them, at any rate) seem to remember about particular times of year. Towards the end of October there is a group that starts to come off the hill each morning and look into the field in anticipation of access to inbye grass/ tupping time. And there are a couple of ewes, who, from mid-August onwards turn and make off as fast as they can at the mere sight of me, to try and prevent me from gathering in their lambs. At other times, especially in winter, they behave perfectly normally.