I don't have a Home Depot CC, but I've used their e-receipts in the last couple of months and I'm reasonably sure that I've ordered online from them in the past.
I certainly hope they didn't compromise the PIN pads in the stores. That could be a Very Bad Thing.
From what I've read so far, this was another case of memory scraping malware[1], most likely running on each POS. The pinpads typically have tamper protection, though I wouldn't completely discount the possibility that we'll see malware at the pinpad level at some point in the future.
I certainly hope they didn't compromise the PIN pads in the stores. That could be a Very Bad Thing.