There's some incorrect information being given here.
The basic ticket/classic package gets you into the party. In there will be all the previously mentioned stuff that you can see same way if you visited say the NYE party or Halloween Soiree. These are the Ducktales parade, lots of character M&Gs, dance party etc... WHICH characters you get to see isn't guaranteed and obviously depends upon how busy things are. You get a photo pass with a package which obviously might be useful.
There are two conferences in the Animagique Theatre and you can buy tickets for these separately (£22) - you don't HAVE to buy a package to see them. They're both about Imagineering apparently, one with Tom and one called 'Duffy and Friends' but no announcement on who will be leading it.The only thing you must have to attend the conferences is a valid ticket for both that talk and the party itself.
There are packages where you can get access to extras such as private M&G with characters, Sunday brunch, workshops with chefs etc. These things are only very limited and are only available in packages. One of the items in a limited package is a 2 hour tour with an Imagineer.
Hope that cleared it up for some!