I think they'll recycle, I recall the first F9 launch (instead of the one with the instantaneous launch window) aborting at a similar point and recycling and eventually launching.
Cutting it close if they don't figure out the problem soon.
---------- Post added at 10:56 PM ---------- Previous post was at 10:55 PM ----------
Elon Musk @elonmusk
Launch aborted by autosequence due to slower than expected thrust ramp. Seems ok on closer inspection. Cycling countdown.
---------- Post added at 11:16 PM ---------- Previous post was at 10:56 PM ----------
Looks like next attempt, if they proceed, will be at the very end of the launch window.
Aiming for a T-0 at 6:44pm EST