Well it couldn't just grow every week until Christmas! The overlong Saturday shows have probably harmed it a bit and that will have had a knock-on effect on the Sunday shows. Last night's show being shorter probably cancelled out the Halloween slump which is why it remained level as opposed to the drop that most people expected. The Sunday shows have dipped a bit from that huge judges houses rating but they have grown every week of the live shows so far, and I can't see it running out of steam a bit like it did in the last few weeks last year.
I do agree though that Strictly has done brilliantly this year. They've revamped it and the viewers have returned, and last night's rating was it's highest non-final rating ever I believe. I hope the producers of Dancing on Ice have been taking notes for next year as that also felt tired this year and dipped in the ratings.
As for ITV's 'exciting news', I suspect it'll be one or more of: the announcement of the I'm A Celebrity line up, more info on ITV3 and 4 HD or some announcements for the Christmas schedule.
Also, provisional schedules on the Radio Times website have the Take That documentary down as airing on Saturday November 13 at 9:30pm, displacing Life Stories. Very good scheduling, it could do extremely well there.