I sincerely hope they do not rush it. I realize that what we've seen in the packets is only a portion of what they have created, but I also realize that they heavily revise it every time they give us a chance to test it. With internal testing ongoing, there should be continued revisions to any addition parts of the game, as well are serious refinement action going into the most recent packet.
I cannot possibly see it being done right before GenCon, and I hope they take until the end of 2014 to finish it properly.
I think the Basic Set has to come out shortly before the Standard books--it cannot come out too far in advance. The reason is that it is supposed to follow the exact same rules, just using a minimalist version of them. The classes for instance, will each have a baked in subclass--that is the same as a subclass in the standard rules. Ie, the warrior subclass will be the only fighter option, the thief will be the rogue, etc. The races will also need to be the same as the standard version. If they put out the basic set before they have completely refined the rules for the standard game, there will be discrepancies, and that will be bad.