It's confusing because people (and I'm sure non DIRT CSR's) keep giving wrong answers and make it sound like they know. You do not lose HD for life based on what package you have. As long as you subscribe, and keep at least however you signed up for it you will keep HD for life. (If you signed up under the no longer available one time $99 then you will always have it, period as a subscriber. If you signed up with Autopay and Paperless billing and keep those you will not lose it as a subscriber, period.) To be able to use it, you must subscribe to a package that has HD channels. I keep seeing those two things getting confused.
Welcome package comes with locals. They will be in HD if available even without HD for life last time I knew, if that has changed I am not aware of it. As others have correctly posted The Welcome pack does not include other HD channels on a regular basis. If you add an allowed package/premium to it, those channels will be in HD if available with HD for Life. Freeviews will be in HD if available.