Hi Chris. Great news! We already have Captions. If you see any videos that don't have them, could you please email us and we'll take care of it: help@teamtreehouse.com
Gracias
That's good news.
The Introduction to Development video does not currently have them and I haven't really poked around at other videos.
Subtitles should be available on all videos when viewed on the website. Any videos without subtitles are currently being subtitled currently and should show up soon.