I pre-ordered and have pre-loaded.
I played Borderlands 1 a few years ago (but never fully completed it, because I mainly bought it as a co-op game for my brother and I, and he lost interest in it a sizable way through, and I didn't want to repeat it all on my own, nor use our co-op character in case he wanted to play again).
And then I got Borderlands 2, and completed it and really enjoyed it.
Then a few months ago, Gerabox had a massive sale on Steam and I got the complete edition dirt cheap with a friend, and we've spent the last few months working our way through the story and DLC.
Then we were both really in love with the trailers and info for the Pre-Sequel, but I had said I'd wait a year for a GOTY edition to come out, rather than have to buy a season-pass, or seperate DLC.
But, my friend being a cheeky git, decided he was just going to straight up pre-order the base game, so that he could play through it by himself first. (He was jealous that I knew all the good parts coming up through our BL2 playthrough).
So, I joined him and now we're both heavily anticipating the weekend in order to play it. :D