Yup! Very annoyed, as I always have an invite. I'll have to line up on the 23rd now!
It doesn't look like there'll be any form of preview really. At least not a public one. There should be a collection launch party for very selected members of the press, in Paris, however this is all after the collection has shown fully on the website! So it's not like they'll see anything earlier than us really...
Images will be sent to publications such as Grazia in the week of the launch, and the ad campaign should surface in selected December issues, all of which should be out after the collection has been shown online. I believe the first will be in UK Vogue & Elle? So there's a very, very slightly chance these will surface before the show goes online. Although I imagine H&M will anticipate that and have made sure it wont be the case. They might also carry some form of preview of the pieces, but I'd say it's highly unlikely, as that would mean they'd have to have the images now, as the issues close very soon.
But no, no preview parties/customer launch events, or anything...They're really working this collection differently to any previous ones.