My train arrives at 7.30 tomorrow.. or My train will arrive at 7.30
Syntactically, the modal auxiliary verb "will" has
two tenses: present and preterite. Semantically, it is used to make
reference to future time (about 80% of its occurrences, I believe) but
also for expressing volition (as in I keep telling my son to get his
hair cut, but he won't; so I've told him he has to --- notice, the
refusals to get his hair cut are in the PAST, and this sentence actually
entails that there IS a haircut in his future!).
The film will be seen at the Sundance festival is syntactically a
present tense clause with "will" as the tensed verb. But in that
example, "will" clearly expressed reference to future time ---
something that could be done in various other ways as well (The film
is going to be seen at the Sundance festival, The film is about to
be seen at the Sundance festival, etc.).