The really good news? This post-credits scene is the first teaser for Deadpool 2, and it delivers everything you'd expect based off the original. Ryan Reynolds, Deadpool himself, and everything that promises.
There are some noted differences between the version I saw in theaters, and there version that Ryan Reynolds posted to YouTube (so here are your SPOILER warnings, folks). The theatrical version has heavy Reynolds voiceover, which creates more of a narrative; does not feature Stan Lee; and does not have Deadpool make a phone call--overall, it felt more ironic as the delayed tension set to the Superman theme music continued. But you're getting to see it without visiting a theater, so maybe you're due whichever version Ryan Reynolds opts to give you. Fear not! Both versions feature his bare ass pressed against the inside of a telephone booth.