I'm hyped about Destiny because conceptually I love Borderlands, but I'm not keen on the gameplay quality, I hate the writing and humor, and the story is junk. If Destiny can improve where BL faultered then it'll be magnificent.
I'll be honest nothing next gen has me wet in my underpants (infamous, the order look good but not mind blowing), but I just like buying new consoles. It's fun. And there will be so many good games available on PSN, games that I usually spend the most time on. Plus I plan to take advantage of the streaming. I played like 80 hours of Binding of Isaac. Would love to stream that for people, and watch my friends' streams.
I'm sure the good games will come. But at the moment it's just the prospect of new pretty hardware and that initial rush and obsession that hits early in console life that I'm most excited for.