If they are going to a 6 month cycle, which to me seems overly ambitious and impracticable for users considering the cost of the higher end I7 core machines, many of us will quite obviously skip the SP3 for its overall lack of improvements plus added expense of a new docking system, keyboard/power cover (if there is to be one) etc.
I read in an article a few months back that MS had the next three generations of surface already planned out. If this is the case then I have to assume either hardware availability limited MS from creating a head turner product or MS thinking is too rigid for the consumers evolving expectations. In the end I don't think it was necessary to push out the SP3 so soon. MS could have waited and put out a more compelling product in Q4 or in Q1 2015.
BTW, PCworld had an accessory listed.... Pen Loop $4.99. Nearly broke out in laughter!