Since I wrote that, we now know that this episode really will be the end! (And that they really did 'jump the shark' quite some time ago.)
I would hope that the final episode of the series would be something a little better than a historical flashback along the lines of '11:59' VOY or 'Carbon Creek' ENT. I would at least expect some kind of closure on the series.
Also, it was reported that at a Convention appearance, Marina Sirtis denied she was going to appear in this.
So, maybe this episode will be totally different.