Why yes, we are in the midst of planning for DC15. Now that we've "done the dance" with the hotel (who are awesome folks, btw!) we know what we can and can't do and should have virtually no surprizes this year. We're planning higher bandwidth, better monitoring, and also some new interactive-type stuff (I hesitate speaking of it for fear of jinxing it!). We're actually spending our funds boosting up our own infrastructure (beyond the Arbua kit we have) so we have more ports, better fibre connectivity, better trunking.
Remember, if you're planning anything "special", have specific needs for your talk, for your demo, for your break-out session, let us know EARLY so we can plan for it.