Finally back from a long day of work and school.
Overall the new pics look awesome, kudos to the art team. Really like the direction they are taking, discovering new places, making your own adventure kind of thing, but in a Mass Effect context. Some of the stuff looks incredible.
I don't know if I'm getting the same sort of vibe as everyone else, but I'm really feeling a KOTOR style story developing, which is massive bonus points if true
Obviously we know very little, and I could be very wrong, but if we want to draw comparisons, I think they said it's sort of becoming a hero and discovering how your personal quest ties in with the larger story, which is sort of how KOTOR played out, with you being a random no-name, discovered abilities and talents, travelled the galaxy, and discovered he was the key to everything.
Plus we have the return of Star Maps here:

The return of Kashyyk/Manaan here:

Star Forge and building the armies here:

Ok, Ok, I'll stop the comparisons here 
Also, another thing I wanted to say, which is exactly what others have said, is that we're sorta in the same spot as last year, where we also got some teaser/concept images. While it might seem this way, this was probably just to whet our appetite for future announcements.
There is no way a game that is more than halfway through development is only at the concept stage. These worlds we're seeing in the images? They are being worked on and most of the main and general orientations of the game (plot, characters, planets, etc.) are probably locked down already and some might be nearing being feature complete. This game has working parts and gameplay that is ready to show. Stuff is all starting to come together, and I'm sure that the devs are starting to see more of a game than of a few concepts and prototypes at this point 
They are just waiting for the right moment to make their announcement. Maybe there were plans to do it today, but they got changed when DAI got delayed. Regardless, all I'm saying is that within the next 3 months, we will have surely have gotten the info we need to start ''Speculations for everyone
'' on these forums, whether it comes through a teaser trailer or other manner. To quote Hackett: ''Evidence against you is shotty at best, but at some point, you'll have to go to BSN Earth and face the music''
Otherwise, happy N7 Day to all, and hopefully this time next year we'll be up over our heads in anticipation and hype over the next installment of Mass Effect 