Well, I think what we have to remember is we get what we pay for. At $7 a month I'm guessing the staff simply doesn't exist to incorporate all of DS, including new rules elements like themes, PLUS all the stuff needed to support Essentials (which is again going a good bit beyond just dropping in some new powers and such).
In any case they're basically saying the ship date on the update has slipped a couple weeks. Not ideal, but in the software world stuff has to WORK before you can ship it. What do you want? Broken code? They gotta both make money and try as best they can to please everyone, AND at the cheapest price possible. As we say in the software world, cheap, fast, good, pick two.