Sakurai recently said he will make and improve SSBB as optimum as possible.
He also said there will be many playable characters, more than you can imagine, and he said the team is still adding and programming characters. There will be more 3rd party characters too.
The combo control, he said, is relatively easy to control
But to those who already played Melee, he recommends the GC controller
The best news is that SE will be in the best quality that is fun to play alone. It takes more than 10 hours to complete the story mode.