No, I haven't forgotten that at all.
First of all, the special DHS reporting only applies in certain areas--only four states.
Second, it only applies to certain rifle purchases.
Finally, and most importantly, it only applies to multiple purchases within a short amount of time from the same dealer.
That said, it is worth pointing out that multiple gun purchases in a short amount of time from the same FFL dealer is one way to make sure that the federal government gets more information than normal reported to them about your firearm purchases.