I remember examining the code for the Optional-Redirect plugin when it first was released. It was short and simple. I should easily be able to build my own version of this plugin if it doesn’t work out of the box with MT3.
In the mean time, I fired up a new blog on the free version of MT3 this afternoon. My initial reaction is that MT3 looks a lot like TypePad. The colors are the same. I haven’t ever used the CMS interface of TypePad, but I would be willing to wager that it is very similar. And the name has changed, too. Instead of being a “Personal Publishing System”, it’s now “Movable Type Publishing Platform”. I suppose that goes well with the pricing structure that so many are upset about.