I just graduated as well. Makk85 basically has it all down.
I would say that the academics "can" kick your ass if you're not all there. If you're distracted, not in the game, sick, or otherwise unsure of yourself by that part of training, you may not handle the "firehose" of information they shove down your throat. Make absolutely sure you want to be there. The new program is shifting emphasis more to academics (mostly SWO-oriented, but still very useful/relevant), so show up with your gameface and be ready to handle studying seriously in a stressful environment.
I would differ in saying that YES, the academics are definitely harder. I was in both classes, the last of the old program, and the first of the new. Take it seriously, because they can and will roll you for failing the academics. It's not super-hard, it's just a lot of stuff to take in at once. I did well (93% academic average or so, despite never having ANY technical or engineering background whatsoever).
I'll be honest though, I thought candio-phase sucked the most in some ways.
My experience:
Indoc = being too busy/tired to notice how much it sucks (you'll fall asleep the moment you hit the pillow)
Academics = being overwhelmed 90% of the time (good luck in engineering)
Candio = being afraid to do anything because you might get in trouble (you're held responsible for your actions to a much greater degree)
My Rules for surviving OCS. Worked for me (except I failed RLP... too many times lol):
Rule 1 - Don't fail the PRT
Rule 2 - Don't fail RLP
Rule 3 - Don't fail the exams
Rule 4 - Don't be THAT guy
Rule 5 - Don't do anything stupid
Just my two cents. Your mileage may (will) vary.