I'm surprised that they've opted for someone so much younger than Tom. But, even more so, I'm surprised that they've opted for someone so much TALLER than Tom! There's a good 10 inches between the two - 5'7" versus 6'5". The poster is going to look like Arnie and Danny DeVito in Twins!
Nikolaj Coster-Waldau is much taller than Tom Cruise and no attempt was made to hide that in Oblivion