Well well:
The whole mission takes about 10 or 15 minutes and ends with the collection of a Forerunner artefact, which is then taken back aboard the UNSC Infinity. Assuming Microsoft don’t go back on their promise of the whole season of episodes being free then Spartan Ops seems like a more than welcome addition to the series.
We've sort of shifted our rhetoric a little bit and part of that is because of the way that Spartan Ops works, and so we're calling it a saga. Because all of the story pieces that we do from now on are going to be connected and actually matter. So a trilogy kind of limits it in a really weird way, because some of the bigger ticket story beat items that are gonna happen are actually gonna happen in Spartan Ops, before the next mainline sequel comes out.