TWO YEARS SINCE THE FIRST DELAY - Sorry for the big arse bump.
This is finally out in March 2016. They had an alpha last month, and the beta is at the end of January for PC, PS4 and Xbox One (29-31st). Give it a pre-order somewhere like Amazon and you'll be given a beta code. Then you can cancel your pre-order before you're charged for anything.
I feel done with Destiny (haven't played it since about late October now), I'm looking at this being my next shooter MMO. Coming out at the right time I guess. Time to give it a go!