Hi Ignacio,
great to hear from you! It's really great to see movement on the OT front for Swift 
Overall we're definitely open to contribute to Open Telemetry, however for this project we'd like to address the wider need of the Swift ecosystem itself (as a whole), and while we're at it also addressing the Open Telemetry story by integrating with it.
We did the same with metrics with SwiftMetrics [1] as well as other projects/frameworks like ServiceTalk [2], and I took a similar approach in a past open source life as well.
I worked out a "strategic plan" so we can get discussing more specifically what we'd like to showcase and/or achieve with this project. The plan draft is available (open, editable) here: GSoC 2020, Swift Tracing: Strategic Plan
In spirit of Managing the Plan, I think it'd be useful if we discussed it a little bit @slashmo, to see if it aligns with what you're interested in, and/or what we could change or clarify more to be reasonable and fun to pull off during this project. Feel free to comment or edit in-line there, and we can also jump on a facetime if you'd like to some time?
Excited to flesh out the details and get working on this :-)
[1] GitHub - apple/swift-metrics: A Metrics API for Swift
[2] AsyncContext :: ServiceTalk Docs
[3] GSoC 2020, Swift Tracing: Strategic Plan (google docs link, open to anyone)