I have just recently discovered that in the making due out this year is a movie called "Ultramarines"
Holy crap that is news to me, and good news at that. Of course its computer generated which I would want nothing less. Real actors portraying to be 7ft tall though can be done as in 300 is to costly a venture at this point, and sometimes the best voices for characters don't have the face or well body to comply. Anyways here is the link to the website and I will keep you informed.
Also they are going to portray the Imperial Fists in this movie as well...so far that is all I know. The teaser is well hardly even that.