Tough job - who can measure up to Clint Eastwood in his heyday? That's who the book was written for.
I like Idris Elba - awesome actor - Stringer Bell.... wow. And Luther. Sole exception being Heimdall perhaps, which I thought was a sop to the PC crowd.
Who else could you cast in that part? Tall order. Although I had envisioned someone leaner - more beef jerky lean and hard body. Sundried. Maybe a starved Damien Lewis could have been an option?
Also, I hope Idris is less glum and serious in the actual movie vs the trailer.
In any case, looks awesome, and I hope they don't fuck it up like with so many other King movie adaptations. Don't know if I dare watch IT though - that book scared me...