I really like the idea of Rider having villains that are out-and-out criminals again. I really like the idea of following a detective character around and using mystery-solving as a framing device.
I also like the idea of the far-future setting. The Gaia Memories are an interesting idea for handling multi-forms and expressing W's current powers.
That said: judging from the trailers, I will be very surprised if Phillip and the female lead don't annoy the living crap out of me. I expect to find Shotaro fairly likable. The villains have a certain Showa charm to them that I appreciate.
In short, I'm expecting W to be a show that has a lot of great ideas on paper, but is somehow produced as a show I can't bear to watch. If this is indeed how things go down, I'll probably just spend this year in Rider catching up on Dragon Knight and waiting for new Decade movies.