It's out in the UK this week, but normally deliveries are in by now. I'm just curious as to whether there's a delay for a few days. Not a big deal obviously, but it's not something i've noticed with x wing releases before. Is there a shipping date that can't be broken?

No.

Scum is technically not released until the 26th. European shippers seem to have gotten sick of waiting/not run into delays they were expecting when they shipped things/something else, but the lack of Scum on shelves in the U.S. isn't the result of a broken shipping date yet. Unless you're referring to distributors in the U.S. not having it yet, which I can't comment on since my local store gets their stuff from a middleman, so I don't know about the state of Scum shipping in the U.S.

Isn't the Scum ship date set at 2/24?

CSI told me they shipped mine today.