Would something like Doctor Who's 50th Anniversary trailer work?
http://www.youtube.com/watch?v=loGm3vT8EAQ
We could be taken on a journey through Albert Square showing key moments in their appropriate places such as Chrissie killing Den in the Vic, Kat revealing to Zoe that she is her mother outside the Vic, Pat and Franks' wedding on Bridge Street, Danielle dying on Turpin Rd etc with key lines echoed.
Also wouldn't it be cool if for about a month before the 30th we could have tiny snippets of iconic moments played on the BBC between programmes?

It would be cool if that channel EE used to be on shows repeats of classic episodes.

I've heard BBC1 showed classic episodes at 3pm for a week when it was the 20th? Is this true? They could do that or at least put some classic ones on BBC3/4.

Talking of 30 years, it's 10 years soon since Chrissie went to prison for killing Den! Wouldn't it be good if she came back? Not full term though as she would probably have to turn nice to stick around, maybe she could come back and ask for Sharon's forgiveness and when she doesn't get it kidnap Denny. Or she could just come back looking for revenge and kidnap Denny and maybe Lexi to make Phil and Sharon pay for putting her behind bars! Anyone like to see something like this? DTC likes comebacks so this could actually be possible.

Sorry OP I've just realised I never actually answered your post with my previous comment. Yes it would be cool to see what you have suggested. When Big Brother ended on Channel 4 they did little classic snipits between adverts, it would be nice to see something like that.

I really hope Chrissie could make a return in the future but I wouldn't want her character to become nice like you said and the 30th would be perfect what with it being a decade since she murdered Den and with Sharon in the show. Although it would be even more epic if Peggy was still in the show and the writing would have to be absolutely perfect for her.

It would be cool if they could find a way to entwine all of the classic moments to make them look as though they are all happening at the same time.

Other than that, I'd love another trailer with all the cast again. I think Fall Out Boy's 'My Songs Know What You Did In The Dark' would be SUCH a good song for the trailer.

http://m.youtube.com/watch?v=dVt0OiIyS-M

I hope they do one of these!