I have faith in Pegg's writing, and even he acknowledged the trailer was pretty bad. The crew being stranded on a planet is reminiscent of 'The Galileo Seven,' which was an excellent episode where the Enterprise shuttlecraft crashed on a hospitable planet full of aggressive, primitive humanoid beings.
They could also go for 'The Devil in the Dark' which has a very 'Alien' vibe.
I still believe a William Shatner cameo is essential, especially after Nimoy's passing. I know Shatner can be difficult and controversial, but no one can deny it will bring a tear to many a fan's eye on the 50th anniversary of this franchise. A scene was written for him in the original script and I'd be disappointed if Pegg chose not to pursue this opportunity.