The original Conan movie is one of the most underrated films in history. People generally go 'herp derp Arnie sucks lol'; but the film was like a latter-day opera.
I for one will be seeing this movie, without a doubt. I'm too much of a RE Howard fan not to. I'm not expecting much, sadly, but Ron Pearlman I hope will lift Momoa above the level of shaved wookie.
And please, just please, don't have every old bad guy dazzling everyone with goddamn magic. That was the glory of Thulsa Doom in the old Conan movie - he was just a damned charismatic dude - a Jim Jones, essentially. A cult leader. And throughout the Hyborian stories (of course Thulsa Doom from the film deviates significantly from the source material; but then again so does Conan's backstory), magic is a decidedly rare thing. Conan himself generally regards 'magic' with a shrewd, analytical approach; openly expecting sorcery to be naught but smoke and mirrors whenever he encounters it.
Oh .. and something else that would ruin it : 2 HD human infantry leading around 20 HD Beholders.