The great thing about this leaked is, now you can set SMS only to mobile contacts, so for SMS blasting, no more prompting you to choose mobile or home contacts.
Would be great if they can assign primary mobile contact. For those who carry more than 1 lines, we can't remember which is the primary line.

Facebook Chat Account is now built in (using same concept as previous Jabber), but problem is, have to merge everything AGAIN....
Still no MSN, Yahoo, etc built in. If future, MSN or LIVE is built in, we need to merge again, unless it can intelligently detect those 3rd party plugins account settings (similar email/account id).

Still NO contacts grouping, NO rigntone assignment to individual contacts/groups.
No options to keep conversations/sms into some folder (e.g. Forwarded SMS - Jokes, Greetings, etc which you can keep into specific folder to be re-use next time).
Still only have 2 profiles, General and Silent and very/extremely simple profile.

Maps still doesn't allow saving of locations/POI...

What else?