That's the plan. Well, not to be reactionary, but to time it all out. To create a plan and stick to it. The system is going to sell fine. Next year there will be lulls. Sony is actually in a much better position than MS to handle these lulls because of all the work they've put in with indie devs. But... still, they can trickle out info at a sustained rate that keeps buzz high. If they drop everything at gamescom (which was never going to happen... but I did hope *some* of it would be there) there would be crazy lulls next year with no games or news.
I wouldn't be surprised if they do have atleast one huge announcement at Gamescom. I would also expect one at TGS. My posts are more warning that people looking for a huge 2014 info dump shouldn't get their hopes up.