Differences between old contrib.admin and new contrib.admin

admin.py

from django.contrib import admin
from django.contrib.flatpages.models import FlatPage

from cms.search.models import SearchKeyword

#class SearchKeywordAdmin(admin.ModelAdmin):
#	"""Provide the admin functions for the SearchKeyword model."""
#	pass

class SearchKeywordInline(admin.StackedInline):
	model = SearchKeyword

class FlatPageAdmin(admin.ModelAdmin):
	fieldsets = (
		(None, {
			'fields': ('url', 'title', 'content', 'sites',)
		}),
		('Advanced options', {
			'classes': ('collapse',),
			'fields': ('enable_comments', 'registration_required', 'template_name',)
		})
	)
	inlines = [
		SearchKeywordInline,
	]

admin.site.register(SearchKeyword, admin.ModelAdmin)
admin.site.unregister(FlatPage)
admin.site.register(FlatPage, FlatPageAdmin)

models.py

from django.db import models
from django.contrib.flatpages.models import FlatPage

class SearchKeyword(models.Model):
  keyword = models.CharField(max_length=50, core=True)
  page = models.ForeignKey(FlatPage)
    
  def __unicode__(self):
    return self.keyword