It's really hard to tell from this picture, and pod shapes can vary greatly even on the same node so it's hard to tell from just one picture. It looks like it has some pest damage or rot, and I'm guessing it's not ripe. I googled pepper pictures real fast and found unripe aji limo, ghost pepper, bhut jolokia, habanero and jalapeno pictures that look like that. Eat it and post what it tastes like, that will help narrow it down.

Did it say Texas sweet heat?