Personally, I'd like to see a Trek film that isnt tied with just one era, but spans several eras... say, some kind of on going plot that returns throughout history. The film could begin in pre-Federation days, with Archer and Enterprise, then move to somewhere just before TOS, (maybe have Kirk in his academy days), then move on to somewhere between TMP and TNG (maybe the Enterprise B and C)... and then finally somewhere post TNG... but it would have to be a really good story, something epic in the veign of Lord of the Rings or Asimov's Foundation series.