The debate continues on whether Aragorn is charging along with elves or men in this Helm’s Deep clip from the official teaser trailer. (page 5, first image)
Here is some more fuel for the fire from Spy Tocata:
“Having been an elf at Helm’s Deep, yes, those must be elves. They have the distinctly Elven swords (curved blade, long handle) we used, and are definitely wearing Elven battle armour, which is bloody painful I can tell you. I’m tall and gangly, and it was tight enough to keep me from breathing properly for the many days I was in it. Orcs are much more comfortable, as are Rohans & Gondorian Rangers. Elving sucks!“
So, from someone on the set, we get further confirmation Elves are at Helm’s Deep.